Ansible 2.x - Address deprecation warning of bare variables

Ansible 2.2 will not allow "bare" variable references
in with_* loops. See https://docs.ansible.com/ansible/porting_guide_2.0.html#deprecated
for details.

Change-Id: I10868644a57ef303070a2a4c096db1b96ff80e43

tasks/galera_cluster_state.yml

@@ -56,7 +56,7 @@
       wsrep_incoming_addresses does not match across the cluster. Please fix before
       re-running the playbooks or override with
       'openstack-ansible -e galera_ignore_cluster_state=true galera-install.yml'.
-  with_items: play_hosts
+  with_items: "{{ play_hosts }}"
   when:
     - not galera_ignore_cluster_state | bool
     - mysql_running.rc == 0

tasks/galera_install.yml

@@ -28,6 +28,6 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: galera_pip_packages
+  with_items: "{{ galera_pip_packages }}"
   tags:
     - galera-pip-packages

tasks/galera_install_apt.yml

@@ -19,7 +19,7 @@
     question: "{{ item.question }}"
     value: "{{ item.value }}"
     vtype: "{{ item.vtype }}"
-  with_items: galera_debconf_items
+  with_items: "{{ galera_debconf_items }}"
   tags:
     - galera-debconf
 
@@ -50,7 +50,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: galera_apt_packages
+  with_items: "{{ galera_apt_packages }}"
   notify: Restart mysql
   tags:
     - galera-apt-packages

tasks/galera_pre_install.yml

@@ -38,7 +38,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: galera_pre_apt_packages
+  with_items: "{{ galera_pre_apt_packages }}"
   tags:
     - galera-pre-apt-packages
 
@@ -54,7 +54,7 @@
   ignore_errors: True
   retries: 5
   delay: 2
-  with_items: galera_gpg_keys
+  with_items: "{{ galera_gpg_keys }}"
   tags:
     - galera-apt-keys
 
@@ -68,7 +68,7 @@
   until: add_keys_fallback|success
   retries: 5
   delay: 2
-  with_items: galera_gpg_keys
+  with_items: "{{ galera_gpg_keys }}"
   when: add_keys|failed and (item.fallback_keyserver is defined or item.fallback_url is defined)
   tags:
     - galera-apt-keys

tasks/galera_upgrade_pre.yml

@@ -48,7 +48,7 @@
   file:
     path: "{{ item }}"
     state: absent
-  with_items: old_sources.stdout_lines
+  with_items: "{{ old_sources.stdout_lines | default([]) }}"
   when:
     - galera_upgrade | bool
   tags: