jool: Add initial recipes for jool NAT64 user-space tools and kernel modules

The jool project contains three different types of outputs. User-space
tools, iptables plugins and kernel modules. The first two are handled by
the main jool recipe while the later one is handled by jool-kmod.

The git tag for version 4.1.5 is used.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>