Move database creation into role (rally)

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.

Depends-On: https://review.openstack.org/578852
Change-Id: Ieec80ccbec9869fc69c81a2aac677d42b77fe0f7

inventory/group_vars/utility_all.yml

@@ -70,6 +70,3 @@ tempest_main_group: utility_all
 
 rally_venv_tag: "{{ venv_tag }}"
 rally_venv_download_url: "{{ venv_base_download_url }}/rally-{{ openstack_release }}-{{ ansible_architecture | lower }}.tgz"
-rally_galera_user: rally
-rally_galera_database_name: rally
-rally_galera_address: "{{ galera_address }}"

playbooks/os-rally-install.yml

@@ -17,19 +17,13 @@
   hosts: utility_all
   gather_facts: "{{ osa_gather_facts | default(True) }}"
   user: root
+  environment: "{{ deployment_environment_variables | default({}) }}"
+  tags:
+    - rally
   pre_tasks:
     - include: common-tasks/unbound-clients.yml
       static: no
       when:
         - hostvars['localhost']['resolvconf_enabled'] | bool
-    - include: common-tasks/mysql-db-user.yml
-      static: no
-      vars:
-        user_name: "{{ rally_galera_user }}"
-        password: "{{ rally_galera_password }}"
-        login_host: "{{ rally_galera_address }}"
-        db_name: "{{ rally_galera_database_name }}"
-      when: inventory_hostname == groups['utility_all'][0]
   roles:
     - role: "os_rally"
-  environment: "{{ deployment_environment_variables | default({}) }}"