Do not depends on the order of the hash vars in ffu repo switching.
Do not depends on the order of the hash vars in ffu repo switching.

As vars in defined as an hash and we can't depends on the ordering
here.

Change-Id: I93fb1811aff6a5c0e5f984f8562a6cdd207f1b5c
Related-Bug: #1749338

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates