Use more reliable option to get cluster ready state and remove ansible_python_interpreter

This is a merge of two previous patches [1,2] which require each
other in order to merge in particular due to unpredictable behaviour
of MariaDB 10.4 during cluster status reporting which is addressed
through [2].

[1] https://review.opendev.org/735204
[2] https://review.opendev.org/735079

Co-Authored-By: Dmitriy Rabotyagov <drabotyagov@vexxhost.com>
Co-Authored-By: Marc Gariepy <gariepy.marc@gmail.com>
Change-Id: Id04fa994f527e2a15a87ba91d56d10eaadf8f58f

tests/host_vars/localhost.yml

@@ -15,5 +15,3 @@
 
 bridges:
   - "br-mgmt"
-
-ansible_python_interpreter: "/usr/bin/python2"

tests/test-galera-server-functional.yml

@@ -18,6 +18,37 @@
   user: root
   gather_facts: true
   tasks:
+    - name: Wait for cluster to be ready
+      block:
+        - name: Wait for cluster ready state
+          command: |
+            mysql -h {{ ansible_host }} \
+                  -p"{{ galera_root_password }}" \
+                  -e "show status like 'wsrep_incoming_addresses';" \
+                  --silent \
+                  --skip-column-names
+          register: mysql_instance_ready
+          retries: 20
+          delay: 5
+          changed_when: false
+          until: mysql_instance_ready is success and mysql_instance_ready.stdout.split()[-1].split(',') | length == groups['galera_all'] | length
+      rescue:
+        - name: Restarting weird maria instance
+          service:
+            name: mariadb
+            state: restarted
+        - name: Wait for cluster ready state
+          command: |
+            mysql -h {{ ansible_host }} \
+                  -p"{{ galera_root_password }}" \
+                  -e "show status like 'wsrep_incoming_addresses';" \
+                  --silent \
+                  --skip-column-names
+          register: mysql_instance_ready
+          retries: 20
+          delay: 5
+          changed_when: false
+          until: mysql_instance_ready is success and mysql_instance_ready.stdout.split()[-1].split(',') | length == groups['galera_all'] | length
     - name: Check cluster incoming addresses
       command: |
         mysql -h {{ ansible_host }} \

zuul.d/project.yaml

@@ -27,6 +27,8 @@
         - openstack-ansible-functional-opensuse-15-ssl:
             voting: false
         - openstack-ansible-functional-ubuntu-bionic-ssl
+        - openstack-ansible-upgrade-aio_metal-ubuntu-bionic:
+            voting: false
     experimental:
       jobs:
         - openstack-ansible-integrated-deploy-aio
@@ -34,3 +36,5 @@
       jobs:
         - openstack-ansible-functional-centos-7-ssl
         - openstack-ansible-functional-ubuntu-bionic-ssl
+        - openstack-ansible-upgrade-aio_metal-ubuntu-bionic:
+            voting: false