Specify specific git hashes of used git repos for undercloud-live

Change-Id: Ib7164c228811b85b3895157ac364ad9a6d7a6120
Specify a hash for neutron

Change-Id: I777e5165d16c48778c22d7737e6e0d91fc6f9c70
update hashes

Change-Id: Ieeff1d12a2b342d929fba7b3ae91193cbf14d686