r17463: A bit of cleanup work:

r17463: A bit of cleanup work:

Remove some unused code: pdb_find_alias is not used anymore, and nobody I
think has ever used the pdb_nop operations for group mapping. smbpasswd and
tdb use the default ones and ldap has its own.

Make the functions pdb_getgr* return NTSTATUS instead of BOOL. Nobody right
now really makes use of it, but it feels wrong to throw away information so
early.

Volker
(This used to be commit f9856f6490fe44fdba97ea86062237d8c74d4bdc)