Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Merge libkqueue test suite through r119

Submitted by: Mark Heily <mark@heily.com>

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)