Add common-bump-milestone-job.

Needs this change: https://review.openstack.org/13785

Change-Id: Ie4b14ca09ad5e6872f74f7df5a9d802c14225a9b
Reviewed-on: https://review.openstack.org/13786
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins

modules/openstack_project/files/jenkins_job_builder/config/release.yaml

@@ -0,0 +1,36 @@
+- job:
+    name: common-bump-milestone
+    concurrent: false
+    node: master
+
+    parameters:
+      - choice:
+          name: PROJECT
+          description: On what project to run?
+          choices:
+            - nova
+            - glance
+            - keystone
+            - horizon
+            - quantum
+            - melange
+            - cinder
+            - python-cinderclient
+            - python-novaclient
+            - python-openstackclient
+            - python-glanceclient
+            - python-keystoneclient
+            - python-quantumclient
+            - python-swiftclient
+      - choice:
+          name: BRANCH
+          description: The branch to update.
+          choices:
+            - master
+            - milestone-proposed
+      - string:
+          name: VALUE
+          description: 'The milestone value to set for this branch.  E.g., "e4" or "rc1".'
+          
+    builders:
+      - shell: "/usr/local/jenkins/slave_scripts/bump-milestone.sh"