This PR changes the behavior of controller API which
wrongly exposes sensitive data to the client. Now, the
API only returns success if secret/configmap exists;
otherwise, an error will be returned.
This PR adds a fake controller client for local CLI operations like
offline spec generation or for unit test purposes. The fake client
now only implements the "Version()" function and more functions
will be implemented once we figure out how to achieve the goals
mentioned above.
