[CI] Fix gate by using zuulv3 live migration and grenade jobs

This patch is a combination of several legacy-to-zuulv3 job patches to
unblock the gate: with the latest Ceph release the legacy grenade jobs
started to fail with the following erros (back till ussuri):

'Error EPERM: configuring pool size as 1 is disabled by default.'

The patch contains almost a clean backport of the job configuration.

Conflicts:
    gate/live_migration/hooks/run_tests.sh
    roles/run-evacuate-hook/tasks/main.yaml

NOTE(melwitt): The conflict is because change
I67255fa1b919a27e92028da95d71ddd4bf53edc1 (lower-constraints: Bump
packaging to 20.4) is not in Ussuri.

NOTE(lyarwood): An additional change was required to the
run-evacuate-hook as we are now running against Bionic based hosts.
These hosts only have a single libvirtd service running so stop and
start only this during an evacuation run.

List of included patches:

1. zuul: Start to migrate nova-live-migration to zuulv3

2. zuul: Replace nova-live-migration with zuulv3 jobs

   Closes-Bug: #1901739
   Change-Id: Ib342e2d3c395830b4667a60de7e492d3b9de2f0a
   (cherry picked from commit 4ac4a04d1843b0450e8d6d80189ce3e85253dcd0)
   (cherry picked from commit 478be6f4fbbbc7b05becd5dd92a27f0c4e8f8ef8)

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

   Change-Id: I02b2b851a74f24816d2f782a66d94de81ee527b0
   (cherry picked from commit 91e53e4c2b90ea57aeac4ec522dd7c8c54961d09)
   (cherry picked from commit c45bedd98d50af865d727b7456c974c8e27bff8b)
   (cherry picked from commit 2af08fb5ead8ca1fa4d6b8ea00f3c5c3d26e562c)

Change-Id: Ibbb3930a6e629e93a424b3ae048f599f11923be3
(cherry picked from commit 1c733d973015999ee692ed48fb10a282c50fdc49)

1 files changed, 64 insertions, 0 deletions

diff --git a/roles/run-evacuate-hook/tasks/main.yaml b/roles/run-evacuate-hook/tasks/main.yaml
new file mode 100644
index 0000000000..f6c80bcb6b
--- /dev/null
+++ b/roles/run-evacuate-hook/tasks/main.yaml
@@ -0,0 +1,64 @@
+- name: Setup resources and mark the subnode as forced down
+  become: true
+  become_user: stack
+  shell: "/opt/stack/nova/roles/run-evacuate-hook/files/setup_evacuate_resources.sh"
+  environment:
+    SUBNODE_HOSTNAME: "{{ hostvars['compute1']['ansible_hostname'] }}"
+
+- name: Fence subnode by stopping q-agt and n-cpu
+  delegate_to: compute1
+  become: true
+  systemd:
+    name: "{{ item }}"
+    state: stopped
+  with_items:
+    - devstack@q-agt
+    - devstack@n-cpu
+
+- name: Register running domains on subnode
+  delegate_to: compute1
+  become: true
+  virt:
+    command: list_vms
+    state: running
+  register: subnode_vms
+
+- name: Destroy running domains on subnode
+  delegate_to: compute1
+  become: true
+  virt:
+    name: "{{ item }}"
+    state: destroyed
+  with_items: "{{ subnode_vms.list_vms }}"
+
+- name: Stop libvirtd on "{{ inventory_hostname }}"
+  become: true
+  systemd:
+    name: "{{ item }}"
+    state: stopped
+    enabled: no
+  with_items:
+    - libvirtd
+
+- name: Run negative evacuate tests
+  become: true
+  become_user: stack
+  shell: "/opt/stack/nova/roles/run-evacuate-hook/files/test_negative_evacuate.sh"
+  environment:
+    CONTROLLER_HOSTNAME: "{{ hostvars['controller']['ansible_hostname'] }}"
+
+- name: Start libvirtd on "{{ inventory_hostname }}"
+  become: true
+  systemd:
+    name: "{{ item }}"
+    state: started
+    enabled: yes
+  with_items:
+    - libvirtd
+
+- name: Run evacuate tests
+  become: true
+  become_user: stack
+  shell: "/opt/stack/nova/roles/run-evacuate-hook/files/test_evacuate.sh"
+  environment:
+    CONTROLLER_HOSTNAME: "{{ hostvars['controller']['ansible_hostname'] }}"