Support proper retrying of telemetry_unittests in recipes

scripts/slave/recipes/chromium_trybot.expected/checklicenses_failure.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium",
       "--builder",
       "linux_chromium_rel",
@@ skipping 228 matching lines @@
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--annotate=gtest",
       "--test-type=telemetry_unittests",
       "--builder-name=linux_chromium_rel",
       "--slave-name=TestSlavename",
       "--build-number=571",
       "--run-python-script",
       "[SLAVE_BUILD]/src/tools/telemetry/run_tests",
-      "--browser=release"
+      "--browser=release",
+      "--write-full-results-to",
+      "/path/to/tmp/json"
     ],
     "name": "telemetry_unittests (with patch)"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--xvfb",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--annotate=gtest",
       "--test-type=telemetry_perf_unittests",
       "--builder-name=linux_chromium_rel",
       "--slave-name=TestSlavename",
       "--build-number=571",
       "--run-python-script",
       "[SLAVE_BUILD]/src/tools/perf/run_tests",
-      "--browser=release"
+      "--browser=release",
+      "--write-full-results-to",
+      "/path/to/tmp/json"
     ],
     "name": "telemetry_perf_unittests (with patch)"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
@@ skipping 192 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  print 'Ignored failures:'@@@",
       "@@@STEP_LOG_LINE@python.inline@  for f in failures['ignored']:@@@",
       "@@@STEP_LOG_LINE@python.inline@    print f@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@sys.exit(0 if success else 1)@@@",
       "@@@STEP_LOG_END@python.inline@@@",
       "@@@STEP_FAILURE@@@"
     ]
   }
 ]