add rdo gpg for havana.

Change-Id: I8bd978d34f9e99efa3641b8ac16aced41c79f2ee
updates to enable CentOS-7.0 .

Change-Id: Ia21ed692ddf29de23f92a05836ff1e78fc9e6884
remove centos vault repo

Change-Id: I0cb613a7f30311ccaf73829826580bfffdabbf26
add reboot options back into CentOS-6, and default CentOS

Change-Id: I6c6bb878b2bd54f5130612eaf91c16512f17df74
Adds nova unit-test job

Includes:
- roles/openstack/unit-tests/prep : prepares VM: upgrade and reboot
- roles/openstack/unit-tests/setup: sets up the testbed for test-run
- roles/openstack/unit-tests/run  : runs test and prints result

Change-Id: I08e44a69d116b118fe0cc813d0290292c19c9ddb