testing: add support for handling Netlink carp messages

MFC after: 2 weeks

tests: fix netlink type parsing.

Netlink attribute type field is 2 bytes, not one.

MFC after: 2 weeks

Testing: add framework for the kernel unit tests.

This changes intends to reduce the bar to the kernel unit-testing by
introducing a new kernel-testing framework ("ktest") based on Netlink,
loadab

Testing: add framework for the kernel unit tests.

This changes intends to reduce the bar to the kernel unit-testing by
introducing a new kernel-testing framework ("ktest") based on Netlink,
loadable test modules and python test suite integration.

This framework provides the following features:
* Integration to the FreeBSD test suite
* Automatic test discovery
* Automatic test module loading
* Minimal boiler-plate code in both kernel and userland
* Passing any metadata to the test
* Convenient environment pre-setup using python testing framework
* Streaming messages from the kernel to the userland
* Running tests in the dedicated taskqueues
* Skipping or parametrizing tests

Differential Revision: https://reviews.freebsd.org/D39385
MFC after: 2 weeks

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tests: fix utils import in netlink tests

MFC after: 2 weeks

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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