zuul: Replace grenade and nova-grenade-multinode with grenade-multinode

If2608406776e0d5a06b726e65b55881e70562d18 dropped the single node
grenade job from the integrated-gate-compute template as it duplicates
the existing grenade-multinode job. However it doesn't remove the
remianing single node grenade job still present in the Nova project.

This change replaces the dsvm based nova-grenade-multinode job with the
zuulv3 native grenade-multinode based job.

Various legacy playbooks and hook scripts are also removed as they are
no longer used. Note that this does result in a loss of coverage for
ceph that should be replaced as soon as a zuulv3 native ceph based
multinode job is available.

Conflicts:
    playbooks/legacy/nova-grenade-multinode/run.yaml

NOTE(melwitt): The conflict is because change
I51f0273e90ee39d644cf85a0bdb9d4f95de6d3c7 ([OVN] Explicitly set grenade
job to ML2/OVS) is not in Wallaby.

Change-Id: I02b2b851a74f24816d2f782a66d94de81ee527b0
(cherry picked from commit 91e53e4)

Author: lyarwood

.zuul.yaml

@@ -287,22 +287,24 @@
 
 - job:
     name: nova-grenade-multinode
-    parent: nova-dsvm-multinode-base
+    parent: grenade-multinode
     description: |
-      Multi-node grenade job which runs gate/live_migration/hooks tests under
-      python 3.
-      In other words, this tests live and cold migration and resize with
-      mixed-version compute services which is important for things like
-      rolling upgrade support.
+      Run a multinode grenade job and run the smoke, cold and live migration
+      tests with the controller upgraded and the compute on the older release.
       The former names for this job were "nova-grenade-live-migration" and
       "legacy-grenade-dsvm-neutron-multinode-live-migration".
-    run: playbooks/legacy/nova-grenade-multinode/run.yaml
-    post-run: playbooks/legacy/nova-grenade-multinode/post.yaml
-    required-projects:
-      - openstack/grenade
-      - openstack/devstack-gate
-      - openstack/nova
     irrelevant-files: *dsvm-irrelevant-files
+    vars:
+      devstack_local_conf:
+        test-config:
+          $TEMPEST_CONFIG:
+            compute-feature-enabled:
+              live_migration: true
+              volume_backed_live_migration: true
+              block_migration_for_live_migration: true
+              block_migrate_cinder_iscsi: true
+      tox_envlist: all
+      tempest_test_regex: ((tempest\.(api\.compute|scenario)\..*smoke.*)|(^tempest\.api\.compute\.admin\.(test_live_migration|test_migration)))
 
 - job:
     name: nova-multi-cell
@@ -454,7 +456,6 @@
               # so that we only run it on changes to networking and libvirt/vif
               # code; we don't need to run this on all changes.
               - ^(?!nova/network/.*)(?!nova/virt/libvirt/vif.py).*$
-        - nova-grenade-multinode
         - nova-live-migration
         - nova-lvm
         - nova-multi-cell
@@ -481,7 +482,7 @@
               - ^setup.cfg$
               - ^tools/.*$
               - ^tox.ini$
-        - grenade:
+        - nova-grenade-multinode:
             irrelevant-files: *policies-irrelevant-files
         - tempest-ipv6-only:
             irrelevant-files: *dsvm-irrelevant-files
@@ -495,7 +496,6 @@
             voting: false
     gate:
       jobs:
-        - nova-grenade-multinode
         - nova-live-migration
         - nova-tox-functional-py38
         - nova-multi-cell
@@ -510,7 +510,7 @@
               - ^(?!nova/network/.*)(?!nova/virt/libvirt/vif.py).*$
         - tempest-integrated-compute:
             irrelevant-files: *policies-irrelevant-files
-        - grenade:
+        - nova-grenade-multinode:
             irrelevant-files: *policies-irrelevant-files
         - tempest-ipv6-only:
             irrelevant-files: *dsvm-irrelevant-files