Ansible lint: use command module instead of shell

Change-Id: Ibf40216b847f103e383f19fe1ef608a75fcfd452
Co-Authored-By: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>

ansible/roles/mariadb/tasks/recover_cluster.yml

@@ -47,7 +47,7 @@
 
     - name: Copying MariaDB log file to /tmp
       become: true
-      shell: "docker cp {{ mariadb_service.container_name }}:/var/log/kolla/mariadb/mariadb.log /tmp/mariadb_tmp.log"
+      command: "docker cp {{ mariadb_service.container_name }}:/var/log/kolla/mariadb/mariadb.log /tmp/mariadb_tmp.log"
 
     # Look for sequence number in logs. Format is:
     # WSREP: Recovered position: <UUID>:<seqno>.

ansible/roles/prechecks/tasks/user_checks.yml

@@ -12,7 +12,7 @@
 
 # NOTE(duonghq): it's only a basic check, should be refined later
 - name: Check if ansible user can do passwordless sudo
-  shell: "true"
+  command: "true"
   become: yes
   register: result
   failed_when: result is failed

ansible/roles/rabbitmq/handlers/main.yml

@@ -23,7 +23,7 @@
     service_name: "rabbitmq"
     service: "{{ rabbitmq_services[service_name] }}"
   become: true
-  shell: "docker exec {{ service.container_name }} rabbitmqctl wait {{ rabbitmq_pid_file }}"
+  command: "docker exec {{ service.container_name }} rabbitmqctl wait {{ rabbitmq_pid_file }}"
   when:
     - inventory_hostname == groups[service.group]|first