Adds a new api-wg repo under the control of the TC

Adds the API WG repository under the list of repos to be controlled
by the TC. The API WG is a cross project workgroup that aims to
provide guidelines and standards for all openstack projects for
desgon of their REST APIs.

Related project-config change: Iecff31860eb36d124ebcc573d20f2a72dabdc8c4

Change-Id: I8c708bcb4ba9a818b6aecdd51e65619c66bb69e1
Merge "Adds a new api-wg repo under the control of the TC"