mount /run in sahara-engine container

sahara-engine service need to run ip netns command in container
when set use_namespaces=true in saraha.conf

Change-Id: I8b10cdd0127e1895ae40dfeed1a5910e6bcd701c
Related-Bug: #1687602
Closes-Bug: #1687624

ansible/roles/sahara/defaults/main.yml

@@ -17,11 +17,13 @@ sahara_services:
     group: sahara-engine
     enabled: true
     image: "{{ sahara_engine_image_full }}"
+    privileged: True
     volumes:
       - "{{ node_config_directory }}/sahara-engine/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"
       - "sahara:/var/lib/sahara/"
       - "kolla_logs:/var/log/kolla/"
+      - "/run:/run:shared"
 
 
 ####################

ansible/roles/sahara/handlers/main.yml

@@ -36,6 +36,7 @@
     name: "{{ service.container_name }}"
     image: "{{ service.image }}"
     volumes: "{{ service.volumes }}"
+    privileged: "{{ service.privileged | default(False) }}"
   when:
     - action != "config"
     - inventory_hostname in groups[service.group]

ansible/roles/sahara/tasks/config.yml

@@ -68,6 +68,7 @@
     common_options: "{{ docker_common_options }}"
     name: "{{ item.value.container_name }}"
     image: "{{ item.value.image }}"
+    privileged: "{{ item.value.privileged | default(False) }}"
     volumes: "{{ item.value.volumes }}"
   register: check_sahara_containers
   when: