If we have realtime caching enabled, 'sip reload' must purge users/peers, even...

If we have realtime caching enabled, 'sip reload' must purge users/peers, even if the config files haven't changed.
(closes issue #12869)
 Reported by: bcnit
 Patches: 
       20090819__issue12869__2.diff.txt uploaded by tilghman (license 14)
 Tested by: lasko


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@213093 65c4cc65-6c06-0410-ace0-fbb531ad65f3