Add new project pbrx

There keep being helper utilities that would be useful to put into pbr,
but we (rightly) want to keep pbr small.

Make a new repo called pbrx that provides a new CLI tool that can do
useful things with pbr repos.

This is not attached to governance anywhere yet on purpose. We can
figure out if it's a good idea before doing that.

Change-Id: Iad0da92c64b35c00bcf66d6d0e617575d5467825

gerrit/acls/openstack/pbrx.config

@@ -0,0 +1,11 @@
+[access "refs/heads/*"]
+abandon = group pbrx-core
+label-Code-Review = -2..+2 group pbrx-core
+label-Workflow = -1..+1 group pbrx-core
+
+[receive]
+requireChangeId = true
+requireContributorAgreement = true
+
+[submit]
+mergeContent = true

gerrit/projects.yaml

@@ -5560,6 +5560,10 @@
   acl-config: /home/gerrit2/acls/openstack/tripleo.config
   groups:
     - tripleo
+- project: openstack/pbrx
+  description: Utilities for projects using pbr
+  use-storyboard: true
+  upstream: https://github.com/emonty/shiny-octo-computing-machine
 - project: openstack/performa
   description: Distributed scenario runner, results processor and report generator
 - project: openstack/performance-docs

zuul/main.yaml

@@ -1020,6 +1020,7 @@
           - openstack/pandaman
           - openstack/panko
           - openstack/patrole
+          - openstack/pbrx
           - openstack/paunch
           - openstack/performa
           - openstack/performance-docs