Move to rhel 7.1
Move to rhel 7.1

rhel 7.0 is not EUS/LTS, need to switch to 7.1.

Change-Id: I71d6824d5c5ee5a0d9d712d269d38c1d38c8aa1b
Related-Bug: #1438878

krtyyy/cookbook-openstack-common,krtyyy/cookbook-openstack-common,openstack/cookbook-openstack-common,tomzo/cookbook-openstack-common,krtyyy/cookbook-openstack-common,openstack/cookbook-openstack-common,tomzo/cookbook-openstack-common,tomzo/cookbook-openstack-common