1. Rename 'maxmessage' to 'maxsecs' to differentiate from 'maxmsg'.

2. Rename 'minmessage' to 'minsecs' for parity.
3. Make 'maxsecs' a per-user option, in addition to global.
(Issue # 8624)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@49075 65c4cc65-6c06-0410-ace0-fbb531ad65f3