Spec API validation
Spec API validation

Implements api-validation:
https://blueprints.launchpad.net/congress/+spec/api-validation

Change-Id: Ib439444a594cb68717a61f3d224af2afb2295145

ramineni/my_congress,ekcs/congress,ekcs/congress,ramineni/my_congress,ramineni/my_congress,ekcs/congress,ekcs/congress,openstack/congress,ramineni/my_congress,openstack/congress