Revert "Add nova to placement DB migration"

As nova_placement -> placement takes place in S->T upgrade,
we don't need this code anymore, as S->U is not supported anyway,
and T->U don't need placement to be migrated again

This reverts commit 3d6cedf859.

Depends-On: https://review.opendev.org/692509
Change-Id: I281d8974ee22e65da8d03c6784bcbbbe79648351

tasks/placement_db_sync.yml

@@ -13,25 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- block:
-  - name: Get mysql-migrate-db.sh path
-    command: "{{ placement_bin }}/python -c \"import pkg_resources;print(pkg_resources.resource_filename('placement_db_tools', 'mysql-migrate-db.sh'))\" "
-    become: yes
-    become_user: "{{ placement_system_user_name }}"
-    changed_when: false
-    register: placement_db_tools
-  # NOTE(noonededpunk) We have rc 3 when data is already migrated and rc 4 when no data for migration
-  - name: Perform DB migration from nova-placement
-    command: "{{ placement_db_tools.stdout }} --migrate /etc/placement/placement-migrate-db.rc"
-    environment:
-      PATH: "{{ placement_bin }}:{{ ansible_env.PATH }}"
-    become: yes
-    become_user: "{{ placement_system_user_name }}"
-    register: placement_migrate
-    changed_when: placement_migrate.rc == 0
-    failed_when: placement_migrate.rc == 1 or placement_migrate.rc == 2 or placement_migrate.rc >= 5
-  when: placement_migrate_flag | default(False)
-
 - name: Perform a Placement DB sync
   command: "{{ placement_bin }}/placement-manage db sync"
   become: yes

tasks/placement_post_install.yml

@@ -27,12 +27,3 @@
       dest: "/etc/placement/placement.conf"
       config_overrides: "{{ placement_placement_conf_overrides }}"
       config_type: "ini"
-
-- name: Copy placement database migration config
-  template:
-    src: placement-migrate-db.rc.j2
-    dest: /etc/placement/placement-migrate-db.rc
-    owner: "root"
-    group: "{{ item.group|default(placement_system_group_name) }}"
-    mode: "0640"
-  when: placement_migrate_flag | default(False)

templates/placement-migrate-db.rc.j2

@@ -1,9 +0,0 @@
-NOVA_API_DB="{{ nova_api_galera_database | default('nova_api') }}"
-NOVA_API_USER="{{ nova_api_galera_user | default('nova_api') }}"
-NOVA_API_PASS="{{ nova_api_container_mysql_password }}"
-NOVA_API_DB_HOST="{{ nova_api_galera_address | default(placement_galera_address) }}"
-PLACEMENT_DB="{{ placement_galera_database }}"
-PLACEMENT_USER="{{ placement_galera_user }}"
-PLACEMENT_PASS="{{ placement_galera_password }}"
-PLACEMENT_DB_HOST="{{ placement_galera_address }}"
-MIGRATE_TABLES="allocations placement_aggregates consumers inventories projects resource_classes resource_provider_aggregates resource_provider_traits resource_providers traits users"