This commit removes the cloudpipe API from nova. This has been
deprecated since change I415760ff634dd85974f0c3f79e788e633852efb5 and no
longer works without nova-cert and the pending removal of the deprecated
nova-network.
Implements bp remove-nova-cert
Change-Id: Ifd1fb13a5953cc66f9cc2561d30a9efcd3f4c92e