Build saml plugin on recent branches

Build the plugin on its own branches: stable-3.0 and stable-3.0. Also
build the plugin master branch against gerrit stable-3.3 branch.

Change-Id: Ic99b4ef3f1f86f60e7e78af21f8866cdcd9eb391
diff --git a/jenkins/gerrit-plugin-saml.yaml b/jenkins/gerrit-plugin-saml.yaml
index 3b61655..e70ed32 100644
--- a/jenkins/gerrit-plugin-saml.yaml
+++ b/jenkins/gerrit-plugin-saml.yaml
@@ -4,11 +4,12 @@
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-3.1
+            - stable-3.0
             - stable-2.16
       - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
           gerrit-branch:
+            - stable-3.3
             - stable-3.2
-            - stable-3.1
-            - stable-3.0