Remove placement_database related options/code

The placement_database config options were added in Newton
but the actual code to use the options was reverted and is
not used.

Change-Id: Ifb09747056750893e442ebe0b4124e861a70ae55
Related-Reviews: I31293ac4689630e4113588ab2c6373cf572b8f38
Closes-Bug: #1670419

defaults/main.yml

@@ -93,13 +93,6 @@ nova_api_db_max_overflow: 10
 nova_api_db_max_pool_size: 120
 nova_api_db_pool_timeout: 30
 
-## DB Placement
-nova_placement_galera_user: nova_placement
-nova_placement_galera_database: nova_placement
-nova_placement_db_max_overflow: 10
-nova_placement_db_max_pool_size: 120
-nova_placement_db_pool_timeout: 30
-
 ## DB Cells
 nova_cell0_database: "nova_cell0"
 nova_cell1_name: "cell1"

releasenotes/notes/nova-placement-database-a8735a1df0c4566f.yaml

@@ -0,0 +1,15 @@
+---
+deprecations:
+  - |
+    The nova_placement database which was implemented in the ocata release of
+    OpenStack-Ansible was never actually used for anything due to reverts in
+    the upstream code. The database should be empty and can be deleted. With
+    this the following variables also no longer have any function and have
+    been removed.
+
+    * ``nova_placement_galera_user``
+    * ``nova_placement_galera_database``
+    * ``nova_placement_db_max_overflow``
+    * ``nova_placement_db_max_pool_size``
+    * ``nova_placement_db_pool_timeout``
+

templates/nova.conf.j2

@@ -226,14 +226,6 @@ max_overflow = {{ nova_api_db_max_overflow }}
 max_pool_size = {{ nova_api_db_max_pool_size }}
 pool_timeout = {{ nova_api_db_pool_timeout }}
 
-{% if nova_placement_service_enabled | bool %}
-[placement_database]
-connection = mysql+pymysql://{{ nova_placement_galera_user }}:{{ nova_placement_container_mysql_password }}@{{ nova_placement_galera_address }}/{{ nova_placement_galera_database }}?charset=utf8{% if nova_galera_use_ssl | bool %}&ssl_ca={{ nova_galera_ssl_ca_cert }}{% endif %}
-
-max_overflow = {{ nova_placement_db_max_overflow }}
-max_pool_size = {{ nova_placement_db_max_pool_size }}
-pool_timeout = {{ nova_placement_db_pool_timeout }}
-{% endif %}
 {% endif %}
 
 [oslo_concurrency]

tests/test-install-previous-nova.yml

@@ -73,10 +73,6 @@
       db_name: "{{ nova_api_galera_database }}"
       db_password: "{{ nova_api_container_mysql_password }}"
 
-    - include: common/previous/create-grant-db.yml
-      db_name: "{{ nova_placement_galera_database }}"
-      db_password: "{{ nova_placement_container_mysql_password }}"
-
     - include: common/previous/create-grant-db.yml
       db_name: "{{ nova_cell0_database }}"
       db_password: "{{ nova_api_container_mysql_password }}"