Add retry to OVS Manager task

The previous task which starts the ovs process must be ready before the OvS
manager is retrieved, otherwise, it fails. I experienced already a problem
because OvS was not ready. Adding a retries logic fixes the problem

Change-Id: I7bfecfc65c76e31ea14aae4728679e434193c092
Signed-off-by: Manuel Buil <mbuil@suse.com>

tasks/providers/setup_ovs_opendaylight.yml

@@ -23,6 +23,9 @@
   command: ovs-vsctl get-manager
   register: ovs_manager
   changed_when: False
+  until: ovs_manager.rc == 0
+  retries: 3
+  delay: 5
 
 - name: Set ODL as OvS manager
   command: ovs-vsctl set-manager {{ ovs_manager_list }}