Fixed validation of novanetwork w/o autoassignment

 Novanetwork can't work with floating ip pools with IDs. And it always
 fails to start cluster when novanetwork used without auto_assignment
 of floating IPs. So added feature to check floating ip pools by name
 in validation

Change-Id: I9ef9897a95350e142bd0729402a8f26906349ee5
Closes-Bug: #1308541
(cherry picked from commit f950942649e13fd6cafd4ce1e9bf966c20df9350)