Add grenade-skip-level (tick-tick) job

This adds a grenade job that specifically skips the last release,
to prove that we can do it. Such a job would facilitate a new
goal of a tick/tock release arrangement where slower-moving operators
could stick on the "tick" release and know that they can upgrade to
the next "tick" release directly.

See https://review.opendev.org/c/openstack/governance/+/828777
for a proposal on why this is needed, and
https://review.opendev.org/c/openstack/grenade/+/826101
for a similar skip level job that's being created from the
integrated grenade job

Change-Id: I2ae55e3e48634cb99807bea80387f74c8244c64d

zuul.d/grenade.yaml

@@ -316,3 +316,31 @@
             PHYSICAL_NETWORK: public
             ENABLE_CHASSIS_AS_GW: false
             OVN_DBS_LOG_LEVEL: dbg
+
+- job:
+    name: neutron-ovs-grenade-multinode-tick-tick
+    parent: neutron-ovs-grenade-multinode
+    description: |
+      Grenade job that skips a release, validating that deployers can skip
+      specific releases as prescribed by our process.
+    vars:
+      # Move this forward when master changes to a new skip-level-allowed
+      # target release. Right now, this is wallaby because master is yoga.
+      # When master is A, this should become yoga, and so forth.
+      grenade_from_branch: stable/wallaby
+      grenade_localrc:
+        NOVA_ENABLE_UPGRADE_WORKAROUND: True
+
+- job:
+    name: neutron-ovn-grenade-multinode-tick-tick
+    parent: neutron-ovn-grenade-multinode
+    description: |
+      Grenade job that skips a release, validating that deployers can skip
+      specific releases as prescribed by our process.
+    vars:
+      # Move this forward when master changes to a new skip-level-allowed
+      # target release. Right now, this is wallaby because master is yoga.
+      # When master is A, this should become yoga, and so forth.
+      grenade_from_branch: stable/wallaby
+      grenade_localrc:
+        NOVA_ENABLE_UPGRADE_WORKAROUND: True

zuul.d/job-templates.yaml

@@ -54,6 +54,8 @@
     experimental:
       jobs:
         - neutron-ovn-grenade-multinode
+        - neutron-ovn-grenade-multinode-tick-tick:
+            voting: false
         - neutron-ovn-tempest-with-uwsgi-loki
         - neutron-ovn-tempest-full-multinode-ovs-master
         - neutron-ovn-tempest-ovs-master
@@ -81,6 +83,7 @@
         - neutron-ovn-tempest-with-neutron-lib-master
         - neutron-ovs-tempest-fips
         - neutron-ovn-tempest-ovs-release-fips
+        - neutron-ovs-grenade-multinode-tick-tick
         - devstack-tobiko-neutron:
             voting: true
         - ironic-tempest-ipa-wholedisk-bios-agent_ipmitool-tinyipa