Add to Orders API Support to Renew X.509 Certificates

This blueprint adds to Barbican the ability to renew an X.509 certificate. The workflow of this blueprint is very similar to that detailed in the reissue blueprint [1]. After a certificate is issued via a Barbican 'certificate' order (which produces a container in Barbican with a unique UUID), it should then be possible to create another Barbican order to renew a certificate by providing the UUID of the original certificate container. The original order information could then be used for the new order, including the original certificate information and ordering information specific to the certificate authority (CA) that issued the certificate originally.

[1] https://blueprints.launchpad.net/barbican/+spec/api-order-ssl-add-reissue-support