V8 Buildbot: Switch ignition tests to v8-side test set.

scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "client.v8",
       "--builder",
       "V8 Linux64",
@@ skipping 603 matching lines @@
       "trigger",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--isolate-server",
       "https://isolateserver.appspot.com",
       "--priority",
       "25",
       "--shards",
       "1",
       "--task-name",
-      "Mjsunit - ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571",
+      "Ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571",
       "--dump-json",
       "/path/to/tmp/json",
       "--expiration",
       "3600",
       "--io-timeout",
       "1200",
       "--hard-timeout",
       "2700",
       "--dimension",
       "cpu",
       "x86-64",
       "--dimension",
       "gpu",
       "none",
       "--dimension",
       "os",
       "Ubuntu-12.04",
       "--dimension",
       "pool",
       "Chrome",
       "--tag",
       "buildername:V8 Linux64",
       "--tag",
       "buildnumber:571",
       "--tag",
-      "data:[dummy hash for mjsunit]",
+      "data:[dummy hash for ignition]",
       "--tag",
       "master:client.v8",
       "--tag",
-      "name:Mjsunit - ignition",
+      "name:Ignition",
       "--tag",
       "os:Ubuntu-12.04",
       "--tag",
       "project:v8",
       "--tag",
       "purpose:CI",
       "--tag",
       "purpose:post-commit",
       "--tag",
       "slavename:TestSlavename",
       "--tag",
-      "stepname:Mjsunit - ignition",
-      "[dummy hash for mjsunit]",
+      "stepname:Ignition",
+      "[dummy hash for ignition]",
       "--",
       "--progress=verbose",
       "--mode",
       "Release",
       "--arch",
       "x64",
       "--outdir",
       "out",
       "--buildbot",
       "--timeout=200",
-      "mjsunit",
+      "ignition",
       "--variants=ignition",
       "--ignition",
       "--exhaustive-variants",
       "--rerun-failures-count=2",
       "--swarming",
       "--json-test-results",
       "${ISOLATED_OUTDIR}/output.json"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "[trigger] Mjsunit - ignition",
+    "name": "[trigger] Ignition",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"Mjsunit - ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"Ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"tasks\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit - ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 0, @@@",
       "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10000\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@STEP_LINK@shard #0@https://chromium-swarm.appspot.com/user/task/10000@@@"
     ]
   },
@@ skipping 414 matching lines @@
       "--merged-test-output",
       "/path/to/tmp/json",
       "--",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--shards",
       "1",
-      "Mjsunit - ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571"
+      "Ignition/Ubuntu-12.04/[dummy has/V8 Linux64/571"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "Mjsunit - ignition",
+    "name": "Ignition",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@durations@01:01:002 mjsunit/Cool.Test@@@",
       "@@@STEP_LOG_LINE@durations@00:00:101 mjsunit/Cool.Test2@@@",
       "@@@STEP_LOG_LINE@durations@@@@",
       "@@@STEP_LOG_LINE@durations@Details:@@@",
       "@@@STEP_LOG_LINE@durations@@@@",
       "@@@STEP_LOG_LINE@durations@Test: mjsunit/Cool.Test@@@",
       "@@@STEP_LOG_LINE@durations@Flags: -f@@@",
       "@@@STEP_LOG_LINE@durations@Command: d8 -f mjsunit/Cool.Test@@@",
       "@@@STEP_LOG_LINE@durations@Duration: 01:01:002@@@",
@@ skipping 85 matching lines @@
       "@@@STEP_LOG_LINE@durations@Duration: 00:00:101@@@",
       "@@@STEP_LOG_END@durations@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]