Build its-base on stable-3.1{2,3,4}

Change-Id: I6dd02ef44b2cb8a3bf5e1d890601d116a72dc501

jenkins/gerrit-bazel-plugin-its-base.yaml

diff --git a/jenkins/gerrit-bazel-plugin-its-base.yaml b/jenkins/gerrit-bazel-plugin-its-base.yaml
index d7895fe..6d30465 100644
--- a/jenkins/gerrit-bazel-plugin-its-base.yaml
+++ b/jenkins/gerrit-bazel-plugin-its-base.yaml
@@ -1,15 +1,10 @@
 - project:
     name: its-base
     jobs:
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
-          branch:
-            - master
-          gerrit-branch:
-            - stable-3.14
-            - stable-3.13
-            - stable-3.12
-          targets: 'plugins/its-base:its-base plugins/its-base:its_base_tests'
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-3.14
+            - stable-3.13
+            - stable-3.12
           targets: 'plugins/its-base:its-base plugins/its-base:its_base_tests'