Following vhost-user specification, replace
all uses of master/slave with backend/frontend
in the vhost crate.
Signed-off-by: Albert Esteve <aesteve@redhat.com>
Convert the vhost git repository into a crate, which hosts vhost crate
for now. Support for vhost-user-backend and other crates will be added
later on.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>