descrambler: unify log messages, some minor logic changes
cwc: return back the key composition - seems like some CA cards returns only single key
Revert "cwc: return back the key composition - seems like some CA cards returns only single key"

This reverts commit da05976c3209df9ef448cb672ee1dbbf4a4d813e.
descrambler: allow single key updates again
capmt: allow single key updates again
descrambler: check for key validity
capmt: there are multiple waiters - use pthread_cond_broadcast()
convert config check to rule

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>