removed core dependency for livestatus

there are situations where it makes sense to install livestatus module
without the core. For example when using shadownaemon which is available
via the naemon-tools pkg.
Also move libnaemon.so into tools pkg because thats the only pkg using the lib
right now. Could be moved into a seperate libnaemon pkg later.

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>