API for Service Chaining
API for Service Chaining

This is an updated patch to the previous APi spec.
It adds more clarification on the API and gives an example of API calls

Change-Id: I1ccaaf9b97025a709a1ba3f0743cb9f4401b0e83
Co-Authored-By: Cathy Hong Zhang <a2e18b486f183d071c9a6eaaebf77f29c9703aa8@huawei.com>

openstack/networking-sfc,openstack/networking-sfc