Cross-build its-phabricator for Gerrit master/2.14

Change-Id: I957d0ecfc70a8f387e7d6ca2c517598e34f24b0d
diff --git a/jenkins/gerrit-buck-bazel-plugin-its-phabricator.yaml b/jenkins/gerrit-buck-bazel-plugin-its-phabricator.yaml
index 00894dd..230fcd0 100644
--- a/jenkins/gerrit-buck-bazel-plugin-its-phabricator.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-its-phabricator.yaml
@@ -5,7 +5,9 @@
           branch:
             - stable-2.13
             - stable-2.12
-      - 'plugin-its-{name}-bazel-{branch}':
+      - 'plugin-its-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
-            - stable-2.14
             - master
+          gerrit-branch:
+            - master
+            - stable-2.14