netlink: refactor KPI for generic Netlink modules

Now that the family and group are completely private to netlink_generic.c,
provide a simple and robust KPI, that would require very simple guarantee

netlink: refactor KPI for generic Netlink modules

Now that the family and group are completely private to netlink_generic.c,
provide a simple and robust KPI, that would require very simple guarantees
from both KPI and the module:

* Strings are used only for family and group registration, that return ID:
uint16_t genl_register_family(const char *name, ...
uint32_t genl_register_group(uint16_t family, const char *name, ...
* Once created families and groups are guaranteed to not disappear and
be addressable by their ID.
* All subsequent calls, including deregistration shall use ID.

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D48845

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netlink: use nitems() and roundup(2) from param.h

While here style nested includes (kernel ones go first).

Reviewed by: melifaro
Differential Revision: https://reviews.freebsd.org/D47557

netlink: move NETLINK define to opt_global.h

Move the NETLINK define into opt_global.h so we can rely on it being
set correctly, without having to remember to include opt_netlink.h.
This ensures tha

netlink: move NETLINK define to opt_global.h

Move the NETLINK define into opt_global.h so we can rely on it being
set correctly, without having to remember to include opt_netlink.h.
This ensures that the NETLINK define is correctly set. If not we
may end up with unloadable modules, due to missing symbols (such as
nlmsg_get_group_writer).

PR: 274306
Reviewed by: imp, markj
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D42179

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tests: make ktest build on ppc.

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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