Staging: pohmelfs: configuration interface.

This patch includes POHMELFS configuration interface based
on the netlink kernel connector. This interface allows to create
configuration groups in the kerenel indexed by mount ID option.

Each configuration group can include multiple servers to work
with and various operation parameters.

Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>