Move database creation into role (nova)

There is no record for why we implement the database creation outside
of the role in the playbook, when we could do it inside the role.

Implementing it inside the role allows us to reduce the quantity of
group_vars duplicated from the role, and allows us to better document
the required variables in the role. The delegation can still be done
as it is done in the playbook too.

In this patch we remove the group_vars which were duplicated from the
role, and remove the DB setup tasks as they are no longer required.

Change-Id: Id43563435631789d7837a7f28cdc971e44b04344
Depends-On: https://review.openstack.org/571785
Depends-On: https://review.openstack.org/574834

inventory/group_vars/nova_all.yml

@@ -36,15 +36,6 @@ nova_ceilometer_enabled: "{{ (groups['ceilometer_all'] is defined) and (groups['
 # If there are any Barbican hosts in the environment, then enable its usage
 nova_barbican_enabled: "{{ hostvars['localhost']['nova_barbican_enabled'] }}"
 
-# The MySQL details for the nova service
-nova_galera_user: nova
-nova_galera_database: nova
-nova_galera_address: "{{ galera_address }}"
-nova_api_galera_user: nova_api
-nova_api_galera_database: nova_api
-nova_api_galera_address: "{{ galera_address }}"
-nova_cell0_database: nova_cell0
-
 nova_external_ssl: "{{ openstack_external_ssl }}"
 nova_ceph_client_uuid: '{{ cinder_ceph_client_uuid | default() }}'
 nova_dhcp_domain: "{{ dhcp_domain }}"

playbooks/os-nova-install.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Prepare MQ/DB services
+- name: Prepare MQ services
   hosts: nova_conductor
   gather_facts: no
   user: root
@@ -44,35 +44,6 @@
         - groups[nova_oslomsg_notify_host_group] | length > 0
       run_once: yes
 
-    - name: Configure MySQL user (nova)
-      include: common-tasks/mysql-db-user.yml
-      vars:
-        user_name: "{{ nova_galera_user }}"
-        password: "{{ nova_container_mysql_password }}"
-        login_host: "{{ nova_galera_address }}"
-        db_name: "{{ nova_galera_database }}"
-      run_once: yes
-
-    - name: Configure MySQL user (nova-api)
-      include: common-tasks/mysql-db-user.yml
-      vars:
-        user_name: "{{ nova_api_galera_user }}"
-        password: "{{ nova_api_container_mysql_password }}"
-        login_host: "{{ nova_api_galera_address }}"
-        db_name: "{{ nova_api_galera_database }}"
-        db_append_privs: "yes"
-      run_once: yes
-
-    - name: Configure MySQL user (nova-api cell0)
-      include: common-tasks/mysql-db-user.yml
-      vars:
-        user_name: "{{ nova_api_galera_user }}"
-        password: "{{ nova_api_container_mysql_password }}"
-        login_host: "{{ nova_api_galera_address }}"
-        db_name: "{{ nova_cell0_database }}"
-        db_append_privs: "yes"
-      run_once: yes
-
 
 
 - name: Install nova-conductor services