Enable merge commits for swift-milestone members.

The openstack/swift (and potentially openstack/python-swiftclient)
projects will be making use of feature branches, so grant the
swift-milestone group permission to upload merge commits for review.

Also make gerritbot report changes for feature/ec on the same
channels as swift master.

Change-Id: I3c86caf3715428f18fa0ee36f1cbc01f0627e188
Reviewed-on: https://review.openstack.org/36526
Reviewed-by: Khai Do <zaro0508@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: John Dickinson <me@not.mn>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins

modules/gerritbot/files/gerritbot_channel_config.yaml

@@ -67,6 +67,7 @@ openstack-dev:
       - openstack-infra/devstack-gate
     branches:
       - master
+      - feature/ec
 
 openstack-doc:
     events:
@@ -293,6 +294,7 @@ openstack-swift:
       - openstack/python-swiftclient
     branches:
       - master
+      - feature/ec
 
 openstack-state-management:
     events:

modules/openstack_project/files/gerrit/acls/openstack/python-swiftclient.config

@@ -1,3 +1,5 @@
+[access "refs/for/refs/*"]
+        pushMerge = group swift-milestone
 [access "refs/heads/*"]
         label-Code-Review = -2..+2 group swift-core
         label-Approved = +0..+1 group swift-core

modules/openstack_project/files/gerrit/acls/openstack/swift.config

@@ -1,3 +1,5 @@
+[access "refs/for/refs/*"]
+        pushMerge = group swift-milestone
 [access "refs/heads/*"]
         label-Code-Review = -2..+2 group swift-core
         label-Approved = +0..+1 group swift-core