CentOS - Jan 2013 - heads up on silent change in recent samba3x update

i guess that upstream doesn't consider the samba3x packages should be
treated the same way as other packages, but i just wanted to warn folks
that the recent samba3x update changed a default setting. if you rely on
hostnames in a hosts allow/deny clause (and possibly elsewhere), things
won't work until you set 'hostname lookups=yes'. given that it
jumped
from 3.5 to 3.6, there may be other changes as well.