Merge ^/vendor/NetBSD/tests/dist@r312294

This includes a number of accepted upstream fixes, as well as
a reimplementation of the net/carp/... testcase (which is
currently unused).

Use _exit instead of exit so the file descriptors aren't flushed twice in the
child processes

Submitted by: pho

Import the NetBSD test suite from ^/vendor/NetBSD/tests/09.30.2014_20.45 ,
minus the vendor Makefiles

Provide directions for how to bootstrap the vendor sources in
FREEBSD-upgrade

MFC after 2 weeks

Import the NetBSD test suite from ^/vendor/NetBSD/tests/09.30.2014_20.45 ,
minus the vendor Makefiles

Provide directions for how to bootstrap the vendor sources in
FREEBSD-upgrade

MFC after 2 weeks
Discussed with: rpaulo
Sponsored by: EMC / Isilon Storage Division

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