Publish draft patchsets in UI and SSH

Adds Publish button to draft patchsets in UI and an option to
publish draft patchsets in the review ssh command. Publishing a draft
patchset makes it visible. Publishing a draft patchset in a draft
change irreversibly upgrades the change status to NEW.

Change-Id: I8ad8ed9d69f3f9e876a9288f568ae3e003a0e257

gerrit-common/src/main/java/com/google/gerrit/common/data/ChangeManageService.java

@@ -37,4 +37,7 @@ public interface ChangeManageService extends RemoteJsonService {
   @SignInRequired
   void restoreChange(PatchSet.Id patchSetId, String message,
       AsyncCallback<ChangeDetail> callback);
+
+  @SignInRequired
+  void publish(PatchSet.Id patchSetId, AsyncCallback<ChangeDetail> callback);
 }