Updated openstack/openstack
Project: openstack/nova  65b409013140665481908927489e89a01814fc3e

Add developer policy about contractual APIs

Document what APIs nova considers to be public contracts, anything not
in this list should be considered a private API.

Clarify the 'API' section to make sure its clear we are talking about
the REST API.

Change-Id: If71adc7a9d5dc1bde79f75d10e67500f6f92b81f