Add 2.16, 3.0 and 3.1 build for rabbitmq plugin

Change-Id: Iddc740dfabaa374e031be11521ce1d4d77d5d39e
diff --git a/jenkins/gerrit-bazel-plugin-rabbitmq.yaml b/jenkins/gerrit-bazel-plugin-rabbitmq.yaml
index 48a144b..9ade867 100644
--- a/jenkins/gerrit-bazel-plugin-rabbitmq.yaml
+++ b/jenkins/gerrit-bazel-plugin-rabbitmq.yaml
@@ -4,3 +4,6 @@
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-3.1
+            - stable-3.0
+            - stable-2.16