change: pdb_getsampwrid() ->pdb_getsampwsid()

change: pdb_getsampwrid() ->pdb_getsampwsid()

passdb interface change, now the passdb modules will be asked for SID not for rid, the modules have been updated with a passthrough function that calls the old getsampwrid() functions.

srv_samr_nt.c functions that made use of the pdb_getsampwrid funcion has been updated to use the SID one.