Create a repo for container devstack plugin

Based on discussion at a review [1], we decide to create a dedicated
devstack plugin for docker. This commit create a repo for that.

[1] https://review.openstack.org/#/c/452575/

Change-Id: I0cbe1eceee5eb20308a16c84d940a1786aeb7a39

gerrit/acls/openstack/devstack-plugin-container.config

@@ -0,0 +1,10 @@
+[access "refs/heads/*"]
+abandon = group devstack-plugin-container-core
+label-Code-Review = -2..+2 group devstack-plugin-container-core
+label-Workflow = -1..+1 group devstack-plugin-container-core
+
+[receive]
+requireChangeId = true
+
+[submit]
+mergeContent = true

gerrit/projects.yaml

@@ -3482,6 +3482,8 @@
   description: DevStack plugin to configure Cinder BlockDeviceDriver
 - project: openstack/devstack-plugin-ceph
   description: DevStack plugin to configure Ceph backend.
+- project: openstack/devstack-plugin-container
+  description: DevStack plugin for installation of container engine
 - project: openstack/devstack-plugin-glusterfs
   description: DevStack plugin to configure GlusterFS backend.
 - project: openstack/devstack-plugin-hdfs

zuul/layout.yaml

@@ -8993,6 +8993,11 @@ projects:
     gate:
       - gate-devstack-plugin-ceph-bashate
 
+  - name: openstack/devstack-plugin-container
+    template:
+      - name: merge-check
+      - name: noop-jobs
+
   - name: openstack/devstack-plugin-glusterfs
     template:
       - name: merge-check