Add "router remove port" to osc
Add "router remove port" to osc

This patch proposes the migration of port
deletion of Neutron's "router-interface-delete"
to OSC's "router remove port".

Change-Id: Ifceabce080aacac9f6410c809fcc097760e0c5ee
Partial-Bug: #1546849
Implements: blueprint neutron-client-advanced-router

dtroyer/osc-lib