server_audit_excl_users and server_audit_incl_users behave weird when assigned.

Joffrey:
then both are changing at the same time
whatever i set
1) set incl=toto
works
2) set excl=tata
both are set (errors should be returned)
3) set incl or excl to something, then both are set to something

if i set incl='';
and excl='ralf'
it sets incl
to ralf