Allan Jude 9cdff681a4 Do not set vfs.root.mountfrom unnecessarily
This causes boot from external media (installer USB image) to mount / from
the default ZFS BE, rather than the USB device.

Reported by:	kmoore
MFC after:	5 days
Sponsored by:	ScaleEngine Inc.
2016-02-07 00:49:15 +00:00
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