Pr update to new rtrlib api

[smlng]

this PR address issue #6 and updates rtr_mgr_init calls to match new RTRlib API and also adds cmake modules to find dependencies, such as libssh, and rtrlib.

This is WIP, as I haven't tested it against/with a real BIRD instance.

[waehlisch]

I get a memory exception. You can check on 141.22.28.223 /prog/....

[smlng]

fixed input params, now it's working as far as I can test it.

[waehlisch]

Thanks @smlng! Why was RTR_INVALID_PARAM not firing?

[smlng]

Oh it was, later on - but first I had to fix a minor memory leak in the config param parser 😄

Though, I was able to run a simple connection test with a BIRD instance (which succeeded), do we know someone with a more production-like setup for testing? Just to be certain, everything is working.