aio_md_test: label the md

Add a label to md devices created by this test. The next time this
test leaks md devices, finding the culprit will be much easier.

Thanks to: sobomax, for adding labels i

aio_md_test: label the md

Add a label to md devices created by this test. The next time this
test leaks md devices, finding the culprit will be much easier.

Thanks to: sobomax, for adding labels in r322969
MFC after: 1 week
Sponsored by: Dell EMC Isilon

(cherry picked from commit 9666cda9764a1d19cbf967940508dc6d2020cbfb)

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aio_md_test: NUL-terminate result of readlink

readlink does not NUL-terminate the output buffer. This led to spurious
failures to destroy the md device because the unit number was garbage.
NUL-term

aio_md_test: NUL-terminate result of readlink

readlink does not NUL-terminate the output buffer. This led to spurious
failures to destroy the md device because the unit number was garbage.
NUL-terminate the output buffer.

Reported by: ASLR
MFC after: 1 week
Sponsored by: Dell EMC Isilon

(cherry picked from commit ea0e1b19f232331bffa75a0a64a6859c40f1cc4d)

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aio_md_test: fix cleanup

ATF cleanup functions cannot use functions such as ATF_REQUIRE
and atf_tc_fail. These functions assert that a test case is
currently running, which is not true during clean

aio_md_test: fix cleanup

ATF cleanup functions cannot use functions such as ATF_REQUIRE
and atf_tc_fail. These functions assert that a test case is
currently running, which is not true during cleanup, so the
process aborts. Change the cleanup function to simply print
to stderr and return.

MFC after: 1 week
Sponsored by: Dell EMC Isilon

(cherry picked from commit c6f92e64b6140f9e095b41687ff09ff973c28e14)

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