Detect Goto in pbx_lua.

This code will actually detect any dialplan jump from any application that
calls ast_explicit_goto().  This change is only being done in trunk as it may
change the way some dialplans execute.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@317721 65c4cc65-6c06-0410-ace0-fbb531ad65f3