Deletegate gerrit project ownership

The openstack-infra/gerrit project[1] tracks upstream Gerrit and also serves
as a fork which we use for review.o.o.  There is a gerrit-core group[2] but
it's not being used yet.  Change ownership of the project from infra-core
to gerrit-core so that we can delegate ownership to a subset of devs working
to maintain openstack's Gerrit.

[1] https://git.openstack.org/cgit/openstack-infra/gerrit
[2] https://review.openstack.org/#/admin/groups/921,members

Change-Id: Id022177dc9ebb8755f334ff02f1aa60e36578056

gerrit/acls/openstack-infra/gerrit.config

@@ -1,20 +1,20 @@
 [access "refs/for/refs/heads/upstream/*"]
-pushMerge = group infra-core
+pushMerge = group gerrit-core
 
 [access "refs/heads/*"]
-abandon = group infra-core
-create = group infra-core
-forgeAuthor = group infra-core
-label-Code-Review = -2..+2 group infra-core
-label-Workflow = -1..+1 group infra-core
+abandon = group gerrit-core
+create = group gerrit-core
+forgeAuthor = group gerrit-core
+label-Code-Review = -2..+2 group gerrit-core
+label-Workflow = -1..+1 group gerrit-core
 
 [access "refs/heads/upstream/*"]
-create = group infra-core
-forgeAuthor = group infra-core
-forgeCommitter = group infra-core
-push = group infra-core
-pushMerge = group infra-core
-pushSignedTag = group infra-core
+create = group gerrit-core
+forgeAuthor = group gerrit-core
+forgeCommitter = group gerrit-core
+push = group gerrit-core
+pushMerge = group gerrit-core
+pushSignedTag = group gerrit-core
 
 [receive]
 requireChangeId = true