Drop devstack-gate roles from devstack zuul jobs

Devstack-gate has been retired and relying on a retired repo for roles
in zuul produces errors (because the roles are no longer in the HEAD of
the repo). It doesn't look like devstack actually relies on these roles
in d-g (if it does they can be ported into devstack instead) so we just
drop the roles specifier for d-g in the devstack job.

NOTE(elod.illes): nova-ceph-multistore job is broken in this branch, so
it is set as non-voting in check queue and removed from gate queue
until it gets fixed.

NOTE(elod.illes): grenade is set as non-voting as it won't pass until
grenade fix [1] is not landed, which is a 'catch 22' as it won't pass
until this patch is not landed.

[1] https://review.opendev.org/c/openstack/grenade/+/919818

Change-Id: I28a39b31f71153a602d41cefe621a216d09a290f
(cherry picked from commit d487302e60)

.zuul.yaml

@@ -315,7 +315,6 @@
     required-projects:
       - opendev.org/openstack/devstack
     roles:
-      - zuul: opendev.org/openstack/devstack-gate
       - zuul: opendev.org/openstack/openstack-zuul-jobs
     vars:
       devstack_localrc:
@@ -760,6 +759,9 @@
         - ironic-tempest-bios-ipmi-direct-tinyipa
         - swift-dsvm-functional
         - grenade:
+            # NOTE(elod.illes): needs to be set back as voting, when grenade
+            # patch merges: https://review.opendev.org/919818
+            voting: false
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -790,6 +792,7 @@
               - ^.*\.rst$
               - ^doc/.*$
         - nova-ceph-multistore:
+            voting: false
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -812,6 +815,9 @@
         - ironic-tempest-bios-ipmi-direct-tinyipa
         - swift-dsvm-functional
         - grenade:
+            # NOTE(elod.illes): needs to be set back as voting, when grenade
+            # patch merges: https://review.opendev.org/919818
+            voting: false
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -823,10 +829,13 @@
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
-        - nova-ceph-multistore:
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^doc/.*$
+        # TODO(elod.illes): nova-ceph-multistore is broken in this branch,
+        # so it is set as non-voting in check queue and commented out here
+        # in gate queue until the job gets fixed.
+        # - nova-ceph-multistore:
+        #     irrelevant-files:
+        #       - ^.*\.rst$
+        #       - ^doc/.*$
     # Please add a note on each job and conditions for the job not
     # being experimental any more, so we can keep this list somewhat
     # pruned.