Add the priority option to the zypper_repo. task
Add the priority option to the zypper_repo. task

The user might want to utilize the priority option which exists in the
zypper_repository module

Change-Id: I76583b14c5925407c191cd3fc5dfca8c8649781f

openstack/openstack-ansible-openstack_hosts,openstack/openstack-ansible-openstack_hosts