Handle CSP service commands (ping, CMP, etc.) from the ground station CLI

[arrooney]

This may require modifications to the parser or maybe to groundstation.py to support the following command format:
<remote>.CSP.<csp serivce>
Where (in terms of the parser), CSP is the "service" and "csp service" is the subservice, but really if the parser finds CSP in the service position, it should short circuit to a new handler that can call the requested function from the python bindings.