Update ansible regtest
Update ansible regtest

Pre-download centos65.box on host to save time.

Change-Id: I19bbc1257d687c89faef0cd9396d8e6f1b3a8385

stackforge/compass-core,openstack/compass-core,openstack/compass-core,stackforge/compass-core,stackforge/compass-core,openstack/compass-core,openstack/compass-core,stackforge/compass-core