live_ast: add commands 'rsync' and 'gen-live-asterisk'

This adds the following two commands to live_ast:
* rsync [user]@host directory
  Copy over all generated files to <directory> at remote host.
  Would allow running live_ast there. Hence allows separating a build
  machine from a test machine.
* gen-live-asteris: regenerate live/asterisk . Useful if copying over
  files to a different directory.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@263250 65c4cc65-6c06-0410-ace0-fbb531ad65f3