Add support for placement_database and cell_v2

This patch adds support for the cell0 database creation, and adjusts the
mysql-db-user.yml playbook to allow append_privs to be specified using
the "db_append_privs" var - defaulting to "omit".

The nova_placement_database is created as is the nova_cell0 database
which has permissions for the nova_api user.

Lastly there is a work around for bugfix:
https://review.openstack.org/#/c/428120/

Once that merges we can remove the "reserved_host_disk_mb: 0" setting.

Change-Id: I5fab3fbe982e12ca05adc051533f81da1093f7c0

playbooks/common-tasks/mysql-db-user.yml

@@ -32,5 +32,6 @@
     host: "{{ item }}"
     state: "present"
     priv: "{{ db_name }}.*:ALL"
+    append_privs: "{{ db_append_privs | default(omit) }}"
   delegate_to: "{{ groups['galera_all'][0] }}"
   with_items: "{{ grant_list | default(['localhost', '%']) }}"

playbooks/inventory/group_vars/nova_all.yml

@@ -26,3 +26,6 @@ nova_package_state: "{{ package_state }}"
 nova_venv_tag: "{{ venv_tag }}"
 nova_bin: "/openstack/venvs/nova-{{ nova_venv_tag }}/bin"
 nova_venv_download_url: "{{ venv_base_download_url }}/nova-{{ openstack_release }}-{{ ansible_architecture | lower }}.tgz"
+
+# TODO: (andymccr) remove this once https://review.openstack.org/#/c/428120/ merges
+nova_reserved_host_disk_mb: 0

playbooks/os-nova-install.yml

@@ -67,6 +67,23 @@
         login_host: "{{ nova_api_galera_address }}"
         db_name: "{{ nova_api_galera_database }}"
       when: inventory_hostname == groups['nova_all'][0]
+    - include: common-tasks/mysql-db-user.yml
+      static: no
+      vars:
+        user_name: "{{ nova_placement_galera_user }}"
+        password: "{{ nova_placement_container_mysql_password }}"
+        login_host: "{{ nova_placement_galera_address }}"
+        db_name: "{{ nova_placement_galera_database }}"
+      when: inventory_hostname == groups['nova_all'][0]
+    - include: common-tasks/mysql-db-user.yml
+      static: no
+      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"
+      when: inventory_hostname == groups['nova_all'][0]
     - include: common-tasks/package-cache-proxy.yml
 
     - name: Add nbd devices to the compute
@@ -181,6 +198,9 @@
     nova_galera_database: nova
     nova_api_galera_user: nova_api
     nova_api_galera_database: nova_api
+    nova_placement_galera_user: nova_placement
+    nova_placement_galera_database: nova_placement
+    nova_cell0_database: nova_cell0
     nova_galera_address: "{{ galera_address }}"
     nova_api_galera_address: "{{ galera_address }}"
     nova_placement_galera_address: "{{ galera_address }}"