neutron: Add rdo-icehouse based on CentOS-7

The appliance is based on rdo-icehouse on top of CentOS-7.

Change-Id: I8d0ce03b6a205d0108b5373f4f8bd22b221f5cc5
Bug-Url: https://bugzilla.redhat.com/1078862
Signed-off-by: Moti Asayag <masayag@redhat.com>