This allows support for host/guest clipboard sharing when using vnc
guests (and possibly other graphics types in the future). This channel
is similar to the spicevmc channel, but it contains a couple additional
options to enable/disable clipboard sharing and specify the mouse mode.
In the case of spice, these settings are specified on the 'graphics'
element, but for qemu-vdagent, they are specified on the channel. For
example:
--channel=qemu-vdagent,source.clipboard.copypaste=on,source.mouse.mode=client
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>