Ensure that Quantum uses configured fixed IP

Fixes bug 1094897

The fix ensures that the fixed IP address specified by the user
is correctly passed to Quantum. That is, when the Quantum port
is created it is created with the specified IP address.

Change-Id: I8191ac2497037e2592b0679962e4606cd24d7844
Merge "Ensure that Quantum uses configured fixed IP"