waylandloginmanager: sometimes some sessions fail FAST on some hardware, so to the user, it might look like an issue with the login when this happens, as it reverts right back to the loginmanagerdisplay.
Generalize DialogWait function (it wasn't being used), have it wait 3 seconds, and tell the user that the login was at least successful

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2604 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9