If host networking is not used for dns container,
dns wont work for other infra containers. This is
unintentionally removed in
https://gerrit.onap.org/r/#/c/oom/offline-installer/+/87422/
Change-Id: I07ce6874e7baedadbdbbcf0913f1d683e19f93cd
Issue-ID: OOM-1866
Signed-off-by: Michal Ptacek <m.ptacek@partner.samsung.com>
 - name: Run dns server container
   docker_container:
     name: dns-server
+    network_mode: host
     image: "{{ dns_server_image }}"
     command: -H /simulated_hosts --log-facility=- --dns-loop-detect
     capabilities: NET_ADMIN