include: Pass nf_sock where needed as parameter

include: Pass nf_sock where needed as parameter

This socket should not be global, it is also hidden in many layers of
code. Expose it as function parameters to decouple the netlink socket
handling logic from the command parsing, evaluation and bytecode
generation.

Joint work with Varsha Rao.

Signed-off-by: Varsha Rao <rvarsha016@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>