Tune up init macros

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Move init.h to uapi/libcompel-plugin.h

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
plugin: Add PLUGIN_CMD_ constants

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
There must be no common/ code

We're to use library service functions instead.

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