Add become for Octavia configuration tasks

This is required to support execution as a non-root user.

Change-Id: Idd2deec2918e5eb7743e60112a91cb31edf5aad3
Close-bug: #1809527

ansible/roles/octavia/tasks/config.yml

@@ -104,6 +104,7 @@
   copy:
     src: "{{ node_custom_config }}/octavia/{{ item }}"
     dest: "{{ node_config_directory }}/octavia-housekeeping/{{ item }}"
+  become: true
   register: octavia_housekeeping_certificate
   when:
     - inventory_hostname in groups[service.group]
@@ -121,6 +122,7 @@
   copy:
     src: "{{ node_custom_config }}/octavia/{{ item }}"
     dest: "{{ node_config_directory }}/octavia-health-manager/{{ item }}"
+  become: true
   register: octavia_health_manager_certificate
   when:
     - inventory_hostname in groups[service.group]