[CentOS] heads up on silent change in recent samba3x update

Mon Jan 21 18:33:55 UTC 2013
Joe Pruett <joey at q7.com>

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.