[FFU] Ensure compatibility with ansible 2.6.

Ansible 2.6 fix didn't properly selct bootstrap node. Also
new ansible changed mysql backend library making it unable
to read misformated my.cnf. This library also needs to have
socket specified if it's going to connect to local server.

Change-Id: I31b38eaf66bb899e72b1bfeca8795e5d1007eee5
Resolves: rhbz#1678235
Closes-bug: #1816422
(cherry picked from commit d8c368e09f)

common/deploy-steps.j2

@@ -700,7 +700,9 @@ outputs:
       fast_forward_upgrade_bootstrap_role_tasks: |
 {%- for role in roles %}
                 - include_tasks: {{role.name}}/fast_forward_upgrade_tasks.yaml
-                  when: tripleo_role_name == '{{role.name}}' and ansible_hostname == {{role.name}}[0]
+                  when:
+                    - tripleo_role_name == '{{role.name}}'
+                    - is_bootstrap_node|bool
 {%- endfor %}
       post_update_steps_tasks: |
 {%- for role in roles %}

docker/services/database/mysql.yaml

@@ -275,13 +275,20 @@ outputs:
             - release == 'ocata'
             - is_bootstrap_node|bool
           block:
+            - name: Remove whitespaces in .my.cnf
+              replace:
+                path: /root/.my.cnf
+                regexp: '^ +'
+                replace: ''
             - name: Create cell0 db
               mysql_db:
                 name: nova_cell0
                 state: present
+                login_unix_socket: '/var/lib/mysql/mysql.sock'
             - name: Grant access to cell0 db
               mysql_user:
                 name: nova
                 host_all: yes
                 state: present
                 priv: '*.*:ALL'
+                login_unix_socket: '/var/lib/mysql/mysql.sock'

docker/services/pacemaker/database/mysql.yaml

@@ -516,13 +516,20 @@ outputs:
             - release == 'ocata'
             - is_bootstrap_node|bool
           block:
+            - name: Remove whitespaces in .my.cnf
+              replace:
+                path: /root/.my.cnf
+                regexp: '^ +'
+                replace: ''
             - name: Create cell0 db
               mysql_db:
                 name: nova_cell0
                 state: present
+                login_unix_socket: '/var/lib/mysql/mysql.sock'
             - name: Grant access to cell0 db
               mysql_user:
                 name: nova
                 host_all: yes
                 state: present
                 priv: '*.*:ALL'
+                login_unix_socket: '/var/lib/mysql/mysql.sock'

puppet/services/database/mysql.yaml

@@ -175,9 +175,11 @@ outputs:
           mysql_db:
             name: nova_cell0
             state: present
+            login_unix_socket: '/var/lib/mysql/mysql.sock'
         - name: Setup cell_v2 (grant access to the nova DB user)
           when: step|int == 4
           mysql_user:
+            login_unix_socket: '/var/lib/mysql/mysql.sock'
             str_replace:
               template: "name=nova password=PASSWORD host=\"%\" priv=\"nova.*:ALL/nova_cell0.*:ALL,GRANT\" state=present"
               params: