This patch moves the permission handling code around a bit.

This patch moves the permission handling code around a bit.

 * moved privilege checks into the command handler functions
   (possible now that we pass the sock data structures around)

 * on UPDATE, delay journal_write until after check_file_access().
   previously, it was possible for a high-priv socket to introduce
   commands into the journal that could be replayed if they were
   still in the journal at next startup.

 * moved has_privilege() further up in the file to avoid need
   for prototype.

--  kevin brintnall

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1587 a5681a0c-68f1-0310-ab6d-d61299d08faa