The spec about adding extra_info field to the response of instances API
The spec about adding extra_info field to the response of instances API

Add a spec about the protectable instances API. User can get the
extra_info of resource instances from the response of this API.

blueprint instances-extra-info

Change-Id: I41c8aeadad9a75744c3b01ef9536c942cf97ef49

openstack/smaug,openstack/smaug