CLI refactor and initial account set up

[aeneasr]

Instead of being able to run administrative commands directly from hydra-host, I want to have an hydra-cli that uses the HTTP REST interface provided hydra-host to manage that stuff. hydra would always require a hydra login command followed by client or user credentials (a valid OAuth2 Token should be issued).

The initial administrative account credentials would be created as followed:

• A one time password (OTP) is generated by hydra when a fresh installation is detected.
• The OTP is printed to STDOUT
• The operator (the user who is installing hydra) runs hydra account create or hydra client create and will be prompted to provide the OTP. If a valid OTP is provided, the operator will be asked for an id and a password and must give confirmation that the account/client to be created is being granted super rights which allow him to do anything anytime anywhere.