queue(3): Add a test for STAILQ_REVERSE()
Reviewed by: kib, markj
MFC after: 1 week
MFC with: e8286eb29516 ("sys/queue.h: add STAILQ_REVERSE")
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D50165
(cherry picked from commit 0285c2428780cdb94bfb7d2dc1806a4bd129324e)