Build pull-replication plugin on stable-3.1/master

Gerrit v3.1 and master need different versions of the pull-replication
plugin.

Change-Id: I401bb1277706807c5353fee331479bf5e2058f4f
diff --git a/jenkins/gerrit-bazel-plugin-pull-replication.yaml b/jenkins/gerrit-bazel-plugin-pull-replication.yaml
index 68581c1..cd371a6 100644
--- a/jenkins/gerrit-bazel-plugin-pull-replication.yaml
+++ b/jenkins/gerrit-bazel-plugin-pull-replication.yaml
@@ -1,9 +1,7 @@
 - project:
     name: pull-replication
     jobs:
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+      - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
-          gerrit-branch:
-            - master
             - stable-3.1