This provides the UI support for the qemu-vdagent channel which allows
clipboard sharing with VNC graphics (see previous commit for more
information).
The channel name in the device list was changed slightly in order to
avoid confusion. Due to the fact that both the spice-vdagent and the
qemu-vdagent specify the same virtio name (com.redhat.spice.0), both of
these channels were showing up in the device list as "Channel spice",
which is a bit confusing.
In order to disambiguate these, channels now show up in the device list
as "Channel {type} ({name})" instead of "Channel {name}". So for
example, a qemu-vdagent channel would show up as:
Channel Qemu vdagent (spice)
Whereas a spice-vdagent channel would show up as:
Channel Spice agent (spice)
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>