Fix "Bad floatingip request" when multiple fixed IPs are present
Fix "Bad floatingip request" when multiple fixed IPs are present

This patch fixes the "Bad floatingip request" error raised when there
are multiple fixed address assigned to a port.

The issue is fixed using the fixed_address provided as a parameter of
_neutron_attach_ip_to_server() when updating the neutron floating IP.

Change-Id: I6bcc000912ee75c9507c3d7e790ffbe10b3b271a

dtroyer/python-openstacksdk,openstack-infra/shade,openstack-infra/shade,stackforge/python-openstacksdk,jsmartin/shade,dtroyer/python-openstacksdk,jsmartin/shade,stackforge/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk