Fix problems with disks disappearing during the ZFS tests, fix some other
ZFS test problems while I'm at it.

tests/sys/cddl/zfs/include/libsas.kshlib
Make "i" a local instead of global variable in
find_verify_sas_disk. The global definition of i was
shadowing the local definition, causing
find_verify_sas_disk to fail to find the disk. I think
that the local variable would've shadowed the global
instead of the other way around, but in this case
another function explicitly typeset i an integer type,
and find_verify_sas_disk was trying to set it to a
string. The problem only happened if
find_verify_sas_disk was called after
wait_until_resilvered, which is why it's hard to notice.

tests/sys/cddl/zfs/tests/hotspare/hotspare.kshlib
Eliminate harmless error message on cleanup

tests/sys/cddl/zfs/tests/zfsd/zfsd_replace_001_pos.ksh
tests/sys/cddl/zfs/tests/zfsd/zfsd.cfg
tests/sys/cddl/zfs/tests/zfsd/zfsd_test.sh
Fix zfsd_replace_001_pos, which has been marked as an
expected failure for a long time. It was failing
because the parallel dd processes finished too quickly,
so the test assumed that they had crashed. But there's
really no reason why they need to be parallel, so I just
replaced them with a single process.

tests/sys/cddl/zfs/tests/zfsd/zfsd.kshlib
tests/sys/cddl/zfs/tests/zfsd/zfsd_autoreplace_001_neg.ksh
tests/sys/cddl/zfs/tests/zfsd/zfsd_autoreplace_002_pos.ksh
tests/sys/cddl/zfs/tests/zfsd/zfsd_autoreplace_003_pos.ksh
tests/sys/cddl/zfs/tests/zfsd/zfsd_hotspare_004_pos.ksh
tests/sys/cddl/zfs/tests/zfsd/zfsd_hotspare_007_pos.ksh
tests/sys/cddl/zfs/tests/zfsd/zfsd_import_001_pos.ksh
Merge common cleanup code into one place. Add a
"camcontrol smpphylist" commmand for debugging purposes.

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