remove unused 'outgoinglimit' code, rename 'incominglimit' to 'call-limit'...

remove unused 'outgoinglimit' code, rename 'incominglimit' to 'call-limit' (old syntax is still supported) (issue #5068)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6458 65c4cc65-6c06-0410-ace0-fbb531ad65f3