Moved verifier specific properties into verifier configs

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1033033002

Cr-Commit-Position: refs/heads/master@{#27527}

testing/commit_queue/config.json

 {
     "commit_burst_delay": 60,
     "commit_user": "commit-bot@chromium.org",
-    "committer_project": "v8",
     "cq_status_url": "https://chromium-cq-status.appspot.com",
     "git_repo_url": "https://chromium.googlesource.com/v8/v8",
     "hide_ref_in_committed_msg": true,
@@ -13,11 +12,14 @@
     "skip_throttle_users": [
         "commit-bot@chromium.org"
     ],
-    "tree_status_url": "https://v8-status.appspot.com",
     "verifiers_no_patch": {
         "experimental_try_job_verifier": {},
-        "reviewer_lgtm_verifier": {},
-        "tree_status_verifier": {},
+        "reviewer_lgtm_verifier": {
+            "committer_project": "v8"
+        },
+        "tree_status_verifier": {
+            "tree_status_url": "https://v8-status.appspot.com"
+        },
         "try_job_verifier": {
             "launched": {
                 "tryserver.v8": {