kevans 79d87e9f35 libbe: Fix zfs_is_mounted check w/ snapshots
'be_destroy' can destroy a boot environment (by name) or a given snapshot.
If the target to be destroyed is a dataset, check if it's mounted. We don't
want to check if the origin dataset is mounted when destroying a snapshot.

PR:		236043
Submitted by:	Rob Fairbanks <rob.fx907 gmail com>
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D19650
2019-04-01 17:44:20 +00:00
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