Add sandbox merge job.

Change-Id: I256ffb43c5d301e8c291a23f2f6a072040757d0f
Reviewed-on: https://review.openstack.org/13798
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/projects.yaml

@@ -492,6 +492,15 @@
       - gate-{name}-merge
 
 
+- project:
+    name: sandbox
+    github-org: openstack-dev
+    node: precise
+    
+    jobs:
+      - gate-{name}-merge
+
+
 - project:
     name: swift
     github-org: openstack

modules/openstack_project/files/zuul/layout.yaml

@@ -729,3 +729,9 @@ projects:
     gate:
       - gate-openstack-planet-merge:
         - gate-openstack-planet-unittest
+
+  - name: openstack-dev/sandbox
+    check:
+      - gate-sandbox-merge
+    gate:
+      - gate-sandbox-merge