Fix rbos-install-vbox bug, even though it's still disabled due to the fact that the VirtualBox drivers don't play well with Weston

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2589 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
update-rbos: fix issue with new apt-get not liking yes being piped into it

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2590 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
force qtwayland xdg shell usage only on default weston shells. qtwayland now supports optional xdg_shell usage, but it relies on a variable

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2591 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9