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

scripts/slave/recipes/perf/ct_top1k_perf.expected/CT_Top1k_slave2_failure.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.perf.fyi",
       "--builder",
       "Linux CT Top1k RR Perf",
@@ skipping 268 matching lines @@
       "chromium.perf.fyi"
     ],
     "name": "Download and Extract Binary"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
-      "[DEPOT_TOOLS]/gsutil.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/binaries/run_chromium_perf_swarming",
       "[SLAVE_BUILD]/src/content/test/ct/run_chromium_perf_swarming"
     ],
     "name": "gsutil download run_chromium_perf_swarming"
   },
   {
     "cmd": [
       "python",
@@ skipping 50 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@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",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/page_sets/1k/slave1/*",
       "[SLAVE_BUILD]/src/content/test/ct/slave1/page_sets"
     ],
     "name": "gsutil download"
   },
   {
     "cmd": [
       "python",
@@ skipping 15 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@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",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/webpage_archives/1k/slave1/*",
       "[SLAVE_BUILD]/src/content/test/ct/slave1/page_sets/data"
     ],
     "name": "gsutil download (2)"
   },
   {
     "cmd": [
       "python",
@@ skipping 47 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@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",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/page_sets/1k/slave2/*",
       "[SLAVE_BUILD]/src/content/test/ct/slave2/page_sets"
     ],
     "name": "gsutil download (3)"
   },
   {
     "cmd": [
       "python",
@@ skipping 15 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@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",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/webpage_archives/1k/slave2/*",
       "[SLAVE_BUILD]/src/content/test/ct/slave2/page_sets/data"
     ],
     "name": "gsutil download (4)"
   },
   {
     "cmd": [
       "python",
@@ skipping 47 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@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",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/page_sets/1k/slave3/*",
       "[SLAVE_BUILD]/src/content/test/ct/slave3/page_sets"
     ],
     "name": "gsutil download (5)"
   },
   {
     "cmd": [
       "python",
@@ skipping 15 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@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",
       "----",
       "cp",
       "gs://cluster-telemetry/swarming/webpage_archives/1k/slave3/*",
       "[SLAVE_BUILD]/src/content/test/ct/slave3/page_sets/data"
     ],
     "name": "gsutil download (6)"
   },
   {
     "cmd": [
       "python",
@@ skipping 511 matching lines @@
       "@@@STEP_LINK@shard #0 isolated out@blah@@@",
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "Step('ct-2 on Ubuntu-14.04') failed with return_code 1",
     "status_code": 1
   }
 ]