zvol.c: fix calling of dmu_objset_prefetch() in zvol_create_minors()
by passing full instead of relative dataset name and prefetching all
visible datasets to be processed later instead of just the pool name
Reviewed by: pjd
Approved by: re (kib)
MFC after: 1 week
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M opensolaris/uts/common/fs/zfs/zfs_ioctl.c
M opensolaris/uts/common/fs/zfs/zvol.c