FreeBSD/src 861729a (r344227)stand/i386/zfsboot zfsboot.c

Remove whole-disk vdev support from zfsboot

This is consistent with the removal of whole-disk vdev support from
libsa/zfs/zfs.c in r342151, and is part way to having the LBAs read
during probe be fully constrained by partition tables when present.

Reviewed by:    tsoome
MFC after:      3 months
Differential Revision:  https://reviews.freebsd.org/D19142
DeltaFile
+5-18stand/i386/zfsboot/zfsboot.c
+5-181 files

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