Sometimes things go wrong. We shouldn't fail a Kolla Ansible run because
of a temporary failure when creating keystone resources.
This task adds retries to the tasks in the service-ks-tasks role.
Default is 5 retries with a 10 second delay, as is used in OpenStack
Ansible.
Change-Id: Ib692062fb93ba330bb9c8a35c684ad06652be8a2