Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

netmap: update unit tests with libnetmap tests

Do a sweep and remove most WARNS=6 settings

Repeating the default WARNS here makes it slightly more difficult to
experiment with default WARNS changes, e.g. if we did something absolutely
bananas an

Do a sweep and remove most WARNS=6 settings

Repeating the default WARNS here makes it slightly more difficult to
experiment with default WARNS changes, e.g. if we did something absolutely
bananas and introduced a WARNS=7 and wanted to try lifting the default to
that.

Drop most of them; there is one in the blake2 kernel module, but I suspect
it should be dropped -- the default WARNS in the rest of the build doesn't
currently apply to kernel modules, and I haven't put too much thought into
whether it makes sense to make it so.

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MFHead @347527

Sponsored by: The FreeBSD Foundation

Polish netmap(4) testcases a bit

1. Not all kernels have netmap(4) support. Check for netmap(4) support before
attempting to run the tests via the `PLAIN_REQUIRE_KERNEL_MODULE(..)` macro.
2. Libr

Polish netmap(4) testcases a bit

1. Not all kernels have netmap(4) support. Check for netmap(4) support before
attempting to run the tests via the `PLAIN_REQUIRE_KERNEL_MODULE(..)` macro.
2. Libraries shouldn't be added to LDFLAGS; they should be added to LIBADD
instead. This allows the build system to evaluate dependencies for sanity.
3. Sort some of the Makefile variables per bsd.README.

1., in particular, will resolve failures when running this testcase on kernels
lacking netmap(4) support, e.g., the i386 GENERIC kernels on ^/stable/11 and
^/stable/12.

PR: 237129
Reviewed by: vmaffione
Approved by: emaste (mentor)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D19864

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MFHead@r345677

Skip this test if if_tap module is not available

PR: 236842
Approved by: asomers
MFC after: 1 month
Sponsored by: Netflix

netmap: add suite of unit tests

Import the unit tests from upstream (https://github.com/luigirizzo/netmap
ba02539859d46d33), and make them ready for use with Kyua.
There are currently 38 regression

netmap: add suite of unit tests

Import the unit tests from upstream (https://github.com/luigirizzo/netmap
ba02539859d46d33), and make them ready for use with Kyua.
There are currently 38 regression tests, which test the kernel control ABI
exposed by netmap to userspace applications:

1: test for port info get
2-5: tests for basic port registration
6-9: tests for VALE
10-11: tests for getting netmap allocator info
12-15: tests for netmap pipes
16: test on polling mode
17-18: tests on options
19-27: tests for sync-kloop subsystem
28-39: tests for null ports
31-38: tests for the legacy NIOCREGIF registers

Reviewed by: ngie
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D18490

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