5151 blkdev should support reporting of physical block size
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Dan McDonald <danmcd@omniti.com>
5144 format should trust blkdev
Reviewed by: Adam Števko <adam.stevko@gmail.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Marcel Telka <marcel@telka.sk>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Dan McDonald <danmcd@omniti.com>
	[illumos-gate merge]

commit 056d874443571821aa60b0584504878f46742bca
    5144 format should trust blkdev
commit 32ce6b819524e8719d4ce58db40a00e9f17843e2
    5151 blkdev should support reporting of physical block size