Run contrail-named & contrail-dns containers in host pid mode

Named pid is used by contrail-dns to identify named start & restart, to
push the records to named. For this reason, changing contrail-named &
contrail-dns containers to run in host pid mode.

Change-Id: I82d5241071ed0b5cb37ecd6acdeea2ba82054ae4
closes-bug: #1747224

playbooks/roles/create_containers/templates/contrail-control.yaml.j2

@@ -37,6 +37,7 @@ services:
     network_mode: "service:network"
     env_file: /etc/contrail/common_control.env
     privileged: true
+    pid: host
     #volumes:
     #  - /var/log/contrail:/var/log/contrail
     volumes_from:
@@ -51,6 +52,7 @@ services:
     image: "{{ container_registry }}/contrail-controller-control-dns:{{ contrail_version_tag }}"
     network_mode: "service:network"
     env_file: /etc/contrail/common_control.env
+    pid: host
     volumes:
       - /var/log/contrail:/var/log/contrail
       - /etc/contrail/control:/etc/contrail

playbooks/roles/install_contrail/templates/contrail-control.yaml.j2

@@ -27,6 +27,7 @@ services:
     network_mode: "host"
     env_file: /etc/contrail/common_control.env
     privileged: true
+    pid: host
     volumes_from:
       - dns
     depends_on:
@@ -36,6 +37,7 @@ services:
     image: "{{ container_registry }}/contrail-controller-control-dns:{{ contrail_version_tag }}"
     network_mode: "host"
     env_file: /etc/contrail/common_control.env
+    pid: host
     volumes:
       - /etc/hosts:/etc/hosts
       - /var/log/contrail:/var/log/contrail