westonlaunchcaller: the controlling Weston host for fullscreen shells can't be run in the background, otherwise tty switching doesn't work. Turning on job control, and brining the primary server job to the foreground allows the file descriptors to reconnect, and tty switching works with fullscreen shells.

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2779 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9