splitting off RPC and friends

[Michael Bushkov]

Hi!

> It would be nice though if we could move the nsswitch support for NIS
> into it's own module at some point so it's only inflicted on people who
> actually do use it. :)

It's not very difficult. I can do it :)
But moving NIS to its own module will cause the code duplication, because 
there are a lot of cases, when nis and files sources are implemented together.

With best regards,
Michael Bushkov
Rostov State University