Use the utility host for db setup tasks

Move it to the service setup host (defaults to utility[0]) instead
of the galera[0] host, and use galera_address (defaults to internal VIP)
as the endpoint instead of a local connection on the db host.

Change-Id: I3d7688ea29f1eb4d65dd50ae82d157f988e404af

defaults/main.yml

@@ -35,8 +35,10 @@ rally_venv_tag: "{{ venv_tag | default('untagged') }}"
 rally_bin: "/openstack/venvs/rally-{{ rally_venv_tag }}/bin"
 
 # Database vars
-rally_db_setup_host: "{{ ('galera_all' in groups) | ternary(groups['galera_all'][0], 'localhost') }}"
+rally_db_setup_host: "{{ openstack_db_setup_host | default('localhost') }}"
+rally_db_setup_python_interpreter: "{{ openstack_db_setup_python_interpreter | default((rally_db_setup_host == 'localhost') | ternary(ansible_playbook_python, ansible_python['executable'])) }}"
 rally_galera_address: "{{ galera_address | default('127.0.0.1') }}"
+rally_galera_port: 3306
 rally_galera_database: rally
 rally_galera_user: rally
 rally_database_connection_string: mysql+pymysql://{{ rally_galera_user }}:{{ rally_galera_password }}@{{ rally_galera_address }}/{{ rally_galera_database }}?charset=utf8

tasks/db_setup.yml

@@ -22,12 +22,16 @@
 
 - name: Setup Database Service (MariaDB)
   delegate_to: "{{ _oslodb_setup_host }}"
+  vars:
+    ansible_python_interpreter: "{{ _oslodb_ansible_python_interpreter }}"
   tags:
     - common-mariadb
   block:
     - name: Create database for service
       mysql_db:
         name: "{{ item.name }}"
+        login_host: "{{ _oslodb_setup_endpoint | default(omit) }}"
+        login_port: "{{ _oslodb_setup_port | default(omit) }}"
       loop: "{{ _oslodb_databases }}"
       no_log: true
 
@@ -38,5 +42,7 @@
         host: "{{ item.1.host | default('%') }}"
         priv: "{{ item.0.name }}.*:{{ item.1.priv | default('ALL') }}"
         append_privs: yes
+        login_host: "{{ _oslodb_setup_endpoint | default(omit) }}"
+        login_port: "{{ _oslodb_setup_port | default(omit) }}"
       loop: "{{ _oslodb_databases | subelements('users') }}"
       no_log: true

tasks/main.yml

@@ -29,6 +29,9 @@
   when: inventory_hostname == groups['utility_all'][0]
   vars:
     _oslodb_setup_host: "{{ rally_db_setup_host }}"
+    _oslodb_ansible_python_interpreter: "{{ rally_db_setup_python_interpreter }}"
+    _oslodb_setup_endpoint: "{{ rally_galera_address }}"
+    _oslodb_setup_port: "{{ rally_galera_port }}"
     _oslodb_databases:
       - name: "{{ rally_galera_database }}"
         users: