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>