Build the quota plugin on stable-2.16

Change-Id: I070c756d4ff7f0ba941d3d9a34d794daa851f5b1
diff --git a/jenkins/gerrit-buck-bazel-plugin-quota.yaml b/jenkins/gerrit-buck-bazel-plugin-quota.yaml
index ca87011..47b5fee 100644
--- a/jenkins/gerrit-buck-bazel-plugin-quota.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-quota.yaml
@@ -9,5 +9,6 @@
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-2.16
             - stable-2.15
             - stable-2.14