Implement a fully automated CA

[MavrosOplarxigos]

For this issue we mainly need an automated user registration process (which would require a credential generation and negotiation protocol between the service and the user) and an automated user credential database which the service can manage and query in real-time.

The process of registering the user with the service is at the moment manual. There is a script meant for automating the generation of the pseudonymous certificates using the original user certificate (the one that the user uses to authenticate himself with and connect with the service).

These main user credentials are stored in a directory outside of the root directory of the repository, namely: ../rsa_creds
Therefore, it would be beneficial to implement a database as well which would allow for storage of all user credentials, main and pseudonymous ones, for example using MySQL together with a python module for allowing for the service to invoke the database such as MySQL Python Connector.