gsutil: use depot_tools.gsutil_py_path instead of path['depot_tools']

scripts/slave/recipe_modules/auto_bisect/example.expected/basic_bisect_script.json

 [
   {
     "cmd": [
       "git",
       "update-ref",
       "refs/heads/master",
       "refs/remotes/origin/master"
     ],
     "cwd": "[TMP_BASE]/fake_checkout_tmp_1",
     "name": "git update-ref"
@@ skipping 141 matching lines @@
       "@@@STEP_LOG_LINE@json.output@]@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_a6298e4afedbf2cd461755ea6f45b0ad64222222.zip"
     ],
     "name": "gsutil ls"
   },
   {
     "cmd": [
       "git",
       "-c",
@@ skipping 13 matching lines @@
     ],
     "cwd": "[TMP_BASE]/fake_checkout_tmp_1",
     "name": "Requesting build for a6298e4afedbf2cd461755ea6f45b0ad64222222 via git try."
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111.zip"
     ],
     "name": "gsutil ls (2)"
   },
   {
     "cmd": [
       "git",
       "-c",
@@ skipping 13 matching lines @@
     ],
     "cwd": "[TMP_BASE]/fake_checkout_tmp_1",
     "name": "Requesting build for 00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111 via git try."
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_a6298e4afedbf2cd461755ea6f45b0ad64222222.zip"
     ],
     "name": "gsutil ls (3)"
   },
   {
     "cmd": [],
     "name": "Triggering test job for a6298e4afedbf2cd461755ea6f45b0ad64222222",
     "trigger_specs": [
@@ skipping 32 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@sys.exit(0)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/bisect-results/a6298e4afedbf2cd461755ea6f45b0ad64222222-test.results"
     ],
     "name": "gsutil ls (4)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cat",
       "gs://chrome-perf/bisect-results/a6298e4afedbf2cd461755ea6f45b0ad64222222-test.results"
     ],
     "name": "gsutil Get test results for build a6298e4afedbf2cd461755ea6f45b0ad64222222",
     "stdout": "/path/to/tmp/"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111.zip"
     ],
     "name": "gsutil ls (5)"
   },
   {
     "cmd": [],
     "name": "Triggering test job for 00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111",
     "trigger_specs": [
@@ skipping 32 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@sys.exit(0)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/bisect-results/00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111-test.results"
     ],
     "name": "gsutil ls (6)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cat",
       "gs://chrome-perf/bisect-results/00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111-test.results"
     ],
     "name": "gsutil Get test results for build 00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111",
     "stdout": "/path/to/tmp/"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_dcdcdc0ff1122212323134879ddceeb1240b0988.zip"
     ],
     "name": "gsutil ls (7)"
   },
   {
     "cmd": [
       "git",
       "-c",
@@ skipping 13 matching lines @@
     ],
     "cwd": "[TMP_BASE]/fake_checkout_tmp_1",
     "name": "Requesting build for dcdcdc0ff1122212323134879ddceeb1240b0988 via git try."
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_dcdcdc0ff1122212323134879ddceeb1240b0988.zip"
     ],
     "name": "gsutil ls (8)"
   },
   {
     "cmd": [],
     "name": "Triggering test job for dcdcdc0ff1122212323134879ddceeb1240b0988",
     "trigger_specs": [
@@ skipping 32 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@sys.exit(0)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/bisect-results/dcdcdc0ff1122212323134879ddceeb1240b0988-test.results"
     ],
     "name": "gsutil ls (9)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cat",
       "gs://chrome-perf/bisect-results/dcdcdc0ff1122212323134879ddceeb1240b0988-test.results"
     ],
     "name": "gsutil Get test results for build dcdcdc0ff1122212323134879ddceeb1240b0988",
     "stdout": "/path/to/tmp/"
   },
   {
     "cmd": [
       "python",
@@ skipping 155 matching lines @@
   {
     "cmd": [],
     "name": "Wiggling revision chromium@a6298e4afe,v8@003"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "ls",
       "gs://chrome-perf/Linux Builder/full-build-linux_a6298e4afedbf2cd461755ea6f45b0ad64222222_51e7ed4b63ad81d8b499e42b888149349afaaca1.zip"
     ],
     "name": "gsutil ls (10)"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 275 matching lines @@
       "{\"bisect_config\": {\"bad_revision\": \"314017\", \"bug_id\": \"-1\", \"builder_host\": \"master4.golo.chromium.org\", \"builder_port\": \"8341\", \"bypass_stats_check\": \"True\", \"command\": \"src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases\", \"dummy_builds\": \"True\", \"dummy_job_names\": \"True\", \"good_revision\": \"314015\", \"gs_bucket\": \"chrome-perf\", \"max_time_minutes\": \"5\", \"metric\": \"mean_input_event_latency/mean_input_event_latency\", \"recipe_tester_name\": \"linux_perf_tester\", \"repeat_count\": \"2\", \"skip_gclient_ops\": \"True\", \"test_type\": \"perf\"}, \"buildername\": \"linux_perf_bisect\", \"mastername\": \"tryserver.chromium.perf\", \"recipe\": \"auto_bisect:example\", \"slavename\": \"dummyslave\"}"
     ],
     "name": "Running Bisection"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]