Rerun checks when an abandoned change is restored

* modules/openstack_project/files/zuul/layout-dev.yaml
* modules/openstack_project/files/zuul/layout.yaml: Also trigger the
check pipeine on Gerrit's change-restored event. Changes can often
sit dormant in an abandoned state for months, and need a freshness
check... which will of course almost always be a merge failure, but
at least it's called out visibly when that happens.

Change-Id: I83e27788d213607292cf40bfbf8c99edd1a971bb
Merge "Rerun checks when an abandoned change is restored"