Implement the virtual sockets device using vhost subsystem of the host
kernel to handle data transfer.
BUG=chromium:708267
TEST=build and run maitred in guest VM without issue
Change-Id: I35b542c0fc7e0fd9296f7ba3e1dfce60bf524d15
Signed-off-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/638838
Reviewed-by: Stephen Barber <smbarber@chromium.org>
