Revert "Fix the problem with ansible_host for ..."

This reverts commit a22f6b34a424d0ce25be7e560d8072a2e84e3ab8.
This commit was merged by mistake.

Change-Id: Ic73bfd8e9d97c3a23629cba69047cc0edefb9cd0
Issue-ID: OOM-1573
Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
diff --git a/ansible/roles/docker/tasks/main.yml b/ansible/roles/docker/tasks/main.yml
index 7240a14..9851d4d 100644
--- a/ansible/roles/docker/tasks/main.yml
+++ b/ansible/roles/docker/tasks/main.yml
@@ -16,15 +16,11 @@
     path: /etc/docker
     state: directory
 
-- name: Resolve the ansible_host address to ip
-  shell: LANG=C ping -n -c1 "{{ hostvars[groups.infrastructure[0]].ansible_host }}" | sed -n 1p | cut -d' ' -f3 | tr -d '()'
-  register: infra_ipv4
-
 - name: Setup docker dns settings
   json_add:
     path: /etc/docker/daemon.json
     key: dns
-    value: "{{ infra_ipv4.stdout }}"
+    value: "{{ hostvars[groups.infrastructure[0]].ansible_default_ipv4.address }}"
   notify:
     - Restart Docker