tests: split netlink.py into multiple files to impove maintainability.

This diff does not contain any functional changes.
Its sole purpose is splitting netlink.py into smaller chunks.
The new code s

tests: split netlink.py into multiple files to impove maintainability.

This diff does not contain any functional changes.
Its sole purpose is splitting netlink.py into smaller chunks.
The new code simplifies the upcoming generic netlink support
introduction.

MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D39365

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netlink: allow creating sockets with SOCK_DGRAM.

Some existing applications setup Netlink socket with
SOCK_DGRAM instead of SOCK_RAW. Update the manpage to clarify
that the default way of creating t

netlink: allow creating sockets with SOCK_DGRAM.

Some existing applications setup Netlink socket with
SOCK_DGRAM instead of SOCK_RAW. Update the manpage to clarify
that the default way of creating the socket should be with
SOCK_RAW. Update the code to support both SOCK_RAW and SOCK_DGRAM.

Reviewed By: pauamma
Differential Revision: https://reviews.freebsd.org/D38075

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