First pass at auto logoff support

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1199 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/agents.conf.sample

@@ -3,6 +3,12 @@
 ;
 ;
 [agents]
+;
+; Define autologoff times if appropriate.  This is how long
+; the phone has to ring with no answer before the agent is
+; automatically logged off (in seconds)
+;autologoff=15
+;
 ; Define the default musiconhold for agents
 ; musiconhold => music_class
 ;