Add support to tcurl as another service

[sr228822]

It would be useful to have a tcurl option to specify the requesting service.

Usecase: Testing auth changes

Something like...
tcurl --asService

[kriskowal]

I’m adding --cn #121

I’m also adding a $USER@ prefix to the caller name to increase traceability. Would that interfere with your use-case?

[sr228822]

uhh, it might. Our authorization models require exact service names. If we prefix the service name with a $USER@ prefix it wouldnt match.

[kriskowal]

I will add a --sneaky flag then.