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

scripts/slave/recipes/bisect.expected/broken_good_revision_test.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "tryserver.chromium.perf",
       "--builder",
       "linux_perf_bisect",
@@ skipping 323 matching lines @@
   {
     "cmd": [],
     "name": "Gathering reference values"
   },
   {
     "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_e28dc0d49c331def2a3bbf3ddd0096eb51551155.zip"
     ],
     "name": "Gathering reference values.gsutil ls",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
@@ skipping 44 matching lines @@
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "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": "Gathering reference values.gsutil ls (2)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
@@ skipping 44 matching lines @@
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "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_e28dc0d49c331def2a3bbf3ddd0096eb51551155.zip"
     ],
     "name": "Gathering reference values.gsutil ls (3)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
@@ skipping 39 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/e28dc0d49c331def2a3bbf3ddd0096eb51551155-test.results"
     ],
     "name": "Gathering reference values.gsutil ls (4)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "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/e28dc0d49c331def2a3bbf3ddd0096eb51551155-test.results"
     ],
     "name": "Gathering reference values.gsutil Get test results for build e28dc0d49c331def2a3bbf3ddd0096eb51551155",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "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": "Gathering reference values.gsutil ls (5)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
@@ skipping 39 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": "Gathering reference values.gsutil ls (6)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "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": "Gathering reference values.gsutil Get test results for build a6298e4afedbf2cd461755ea6f45b0ad64222222",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@SET_BUILD_PROPERTY@extra_result_code@[\"B4T_REF_RANGE_FAIL\"]@@@"
     ]
@@ skipping 85 matching lines @@
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]