NBL-51. Added assoc/dissoc functions for floating IPs.
NBL-51. Added assoc/dissoc functions for floating IPs.

Change-Id: Id323f8af25ad68edd1c2a87864225af911509bd1

Brocade-OpenSource/OpenStack-DNRM-Neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron