Transform IPAddress to string when creating port (unittest)
Transform IPAddress to string when creating port (unittest)

If ip address is provided when running nova boot, nova compute
will invoke neutron client to create a port. However, the ip
address parameter is an IPAddress object so neutron client will
fail to send the request to neutron server. Transform IPAddress
object to string to address this issue.

Change-Id: I858cca475748795aa2532f32bfe0f1443b30966f
Closes-Bug: #1408529
(cherry picked from commit aae858a246e20b1bf55004517b5d9ab28968190a)

Conflicts:
	nova/tests/unit/network/test_neutronv2.py

eayunstack/nova,eayunstack/nova