Add a tag for CI messages

This enables filtering bot/internal messages by using the
"Only comments" button.

Change-Id: I7f8b2fa7888a8c2a8e77b45575e7fe328ac8d9e1
Reviewed-by: Frederik Gladhorn <[email protected]>

Author: orgads

src/main/java/com/googlesource/gerrit/plugins/qtcodereview/QtStage.java

@@ -186,7 +186,7 @@ private Change changeToStaging(RevisionResource rsrc, IdentifiedUser submitter,
                                                                         Change.Status.STAGED,
                                                                         "Staged for CI", // defaultMessage
                                                                         null, // inputMessage
-                                                                        null  // tag
+                                                                        "autogenerated:ci"  // tag
                                                                         );
             Result result = qtUtil.updateRef(git, stagingBranchKey.get(), commit.toObjectId(), false);
             referenceUpdated.fire(projectKey, stagingBranchKey.get(), destId, commit.toObjectId(), submitter.state());

src/main/java/com/googlesource/gerrit/plugins/qtcodereview/QtUtil.java

@@ -340,7 +340,7 @@ private ObjectId pickChangesToStagingRef(Repository git,
                                                       null, // newStatus
                                                       null, // defaultMessage
                                                       null, // inputMessage
-                                                      null  // tag
+                                                      "autogenerated:ci"  // tag
                                                       ).toObjectId();
         }
         return newId;