Revert "Remove priviledged mode for nova-api"

This reverts commit c18615efd5.

This patch fixs nova-api failure on ubuntu binary.

Change-Id: Ie411399eccb0ef7ee004f77a9b1adceca3aa0cc5
Related-Bug: #1715404

ansible/roles/nova/defaults/main.yml

@@ -46,6 +46,7 @@ nova_services:
     group: "nova-api"
     image: "{{ nova_api_image_full }}"
     enabled: True
+    privileged: True
     volumes:
       - "{{ node_config_directory }}/nova-api/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"

ansible/roles/nova/handlers/main.yml

@@ -85,6 +85,7 @@
     common_options: "{{ docker_common_options }}"
     name: "{{ service.container_name }}"
     image: "{{ service.image }}"
+    privileged: "{{ service.privileged | default(False) }}"
     volumes: "{{ service.volumes|reject('equalto', '')|list }}"
   when:
     - action != "config"