add mac_address in floatingip update
add mac_address in floatingip update

Fix BVS-3124. floatingip API is called if BCF controller has
floatingip capability.

Change-Id: I18351895364acd797c177b3cd24408fdb38307de

openstack/networking-bigswitch,openstack/networking-bigswitch,wolverineav/networking-bigswitch,stackforge/networking-bigswitch,stackforge/networking-bigswitch,wolverineav/networking-bigswitch