This patch does following:
* Removes X509keypair controller as there is already Certificate
controller for same purpose.
* Removes X509keypair conductor.
* Removes name, ca_cert and bay_uuid from x509keypair model as
Bay model already holds certificate references.
* Add intermediates and private_key_passphrase to x509keypair
model.
* Remove related tests and changes.
Change-Id: I9271221cd1d07c672c4a380a4ae3593237fca66a
Partially-Implements: blueprint barbican-alternative-storeX