Make-up a MonitorConfig if the server doesn't provide one
Make-up a MonitorConfig if the server doesn't provide one

This allows easier compatibility for clients that don't have to
check and interact differently depending on channel capabilities.

dezelin/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,mathslinux/spice-gtk,flexVDI/spice-gtk,Fantu/spice-gtk,fgouget/spice-gtk,guodong/spice-gtk,SPICE/spice-gtk,mathslinux/spice-gtk,dezelin/spice-gtk,fgouget/spice-gtk,dezelin/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,flexVDI/spice-gtk,SPICE/spice-gtk,guodong/spice-gtk,mathslinux/spice-gtk,SPICE/spice-gtk,elmarco/spice-gtk,elmarco/spice-gtk,dezelin/spice-gtk,Fantu/spice-gtk,guodong/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,mathslinux/spice-gtk,guodong/spice-gtk