FreeBSD/src 7c52f91 (r343123)stand/libsa/zfs zfsimpl.c

loader should ignore active multi_vdev_crash_dump feature on zpool

Since the loader zfs reader does not need to read the dump zvol, we can
just enable the feature.

illumos issue #9051 https://www.illumos.org/issues/9051

MFC after:      2 weeks
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+1-0stand/libsa/zfs/zfsimpl.c
+1-01 files

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