Add 2.14 support manifest-subscription plugin

Change-Id: Ic1e0cc09c65e608cdad2bc2cf1fb64bf4e1d5d0b
diff --git a/jenkins/gerrit-mvn-plugin-manifest-subscription.yaml b/jenkins/gerrit-mvn-plugin-manifest-subscription.yaml
index 6b4d580..33b06d6 100644
--- a/jenkins/gerrit-mvn-plugin-manifest-subscription.yaml
+++ b/jenkins/gerrit-mvn-plugin-manifest-subscription.yaml
@@ -3,5 +3,6 @@
     repo: manifest-subscription
     branch:
       - master
+      - stable-2.14
     jobs:
       - 'plugin-{repo}-mvn-{branch}'