Cross-build changemessage for Gerrit 2.14

Change-Id: I337b10d2c950c1b9dfc912fd96c28ef32ef58287
diff --git a/jenkins/gerrit-buck-bazel-plugin-changemessage.yaml b/jenkins/gerrit-buck-bazel-plugin-changemessage.yaml
index d3616b1..af5eeb5 100644
--- a/jenkins/gerrit-buck-bazel-plugin-changemessage.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-changemessage.yaml
@@ -1,6 +1,9 @@
 - project:
     name: changemessage
     jobs:
-      - 'plugin-{name}-bazel-{branch}':
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
+          gerrit-branch:
+            - master
+            - stable-2.14