Build autosubmitter plugin for 2.15

Change-Id: I663aff8c7e29fe93a49b572f2ebba2fcb0993c66
diff --git a/jenkins/gerrit-bazel-plugin-autosubmitter.yaml b/jenkins/gerrit-bazel-plugin-autosubmitter.yaml
index ad20d26..912a59d 100644
--- a/jenkins/gerrit-bazel-plugin-autosubmitter.yaml
+++ b/jenkins/gerrit-bazel-plugin-autosubmitter.yaml
@@ -3,6 +3,11 @@
     jobs:
       - 'plugin-{name}-bazel-{branch}':
           branch:
-            - master
             - stable-2.14
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - master
+            - stable-2.15