convert: Add debug messages on conversion stages

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
socket: Fix SKB queue conversion

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
tests: Update

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>