Add missing parameters for port creation

Recent API changes in N1KV controller require parameters such as
subnet id and IP address to handle port creation successfully.
Without these mandatory paramters, the REST call fails.
This patch addresses that by passing in the missing parameters
in the REST body.

Change-Id: I4cec6868051f492b9d1245ab201ff6c1a0837848
Closes-Bug: #1290561
Merge "Add missing parameters for port creation"