Readded cleanup code to NotificationEvent.t to remove test data if FS backend is used.
Readded cleanup code to NotificationEvent.t to remove test data if FS backend is used.

MBRG/otrs,mburggraf/otrs,s7design/otrs,xhoy/otrs,xhoy/otrs,rudy500/otrs,s7design/otrs,crythias/otrs,crythias/otrs,s7design/otrs,xhoy/otrs,rudy500/otrs,s7design/otrs,xhoy/otrs,crythias/otrs,MBRG/otrs,MBRG/otrs,mburggraf/otrs,rudy500/otrs,mburggraf/otrs,rudy500/otrs,MBRG/otrs,rudy500/otrs,MBRG/otrs,mburggraf/otrs,crythias/otrs,mburggraf/otrs,s7design/otrs,xhoy/otrs,crythias/otrs