Automatically update the connection state for RandR
outputs in Xvnc as virtual displays become enabled/disabled.
This seems to make applications happier than just
clearing the mode.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5098 3789f03b-4d11-0410-bbf8-ca57d06f2519
Apparently it is more kosher to completely disassociate an
output from its CRTC than just removing the mode when
disabling an output. This is what "xrandr --off" does.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5099 3789f03b-4d11-0410-bbf8-ca57d06f2519