MFC r305468:

Port contrib/netbsd-tests/kernel/kqueue/... as tests/sys/kqueue/...

proc2_test must be skipped because the invariant tested
(`ke.fflags & NOTE_TRACKERR`) doesn't pass.

MFC r304797,r305467:

r304797 (by jmmv):

Make use of Kyua's work directories.

Change the vnode tests to use the current directory when creating temporary
files, which we can assume is a volatile work directory, and then make the
kqueue_test.sh driver _not_ abandon the directory created by Kyua.

This makes the various kqueue tests independent of each other, and ensures
the temporary file is cleaned up on failure.

Problem spotted by asomers@ when reviewing D4254.

r305467:

Move tests/sys/kqueue/... to tests/sys/kqueue/libkqueue/...

This is being done to clearly distinguish the libkqueue tests
from the (soon to be imported) NetBSD tests.

MFC r282063:

Integrate tools/regression/kqueue into the FreeBSD test suite as
tests/sys/kqueue

Integrate tools/regression/kqueue into the FreeBSD test suite as
tests/sys/kqueue

MFC after: 1 week

Integrate tools/regression/kqueue into the FreeBSD test suite as tests/sys/kqueue

Integrate more tests into the FreeBSD test suite from tools/regression, etc

NO_MAN= has been deprecated in favor of MAN= for some time, go ahead
and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will be
addressed in a future commit.

Always assign WARNS using ?=

- fix some nearby style bugs
- include Makefile.inc where it makes sense and reduces duplication

Approved by: ed (co-mentor)

Add Mark Heily's libkqueue test suite as a general kqueue test suite to
tools/regression. It tests a number of aspects of kqueue behavior,
although not all currently pass (possibly bugs in the test suite?).

Submitted by: Mark Heily <mark at heily.com>
Obtained from: svn://mark.heily.com/libkqueue/trunk/test (r114)