[PATCH] Transform vfs.root.mountfrom into a list of fs:device

[Attilio Rao]

This patch adds the possibility to specify multiple couplets of
fs:device for the environ vfs.root.mountfrom (space separated) rather
just one item:
http://www.freebsd.org/~attilio/Sandvine/STABLE_8/vfsrootmountfrom/vfsrootmountfrom.diff

The one going to boot is the first valid one.
While there, this patch also fixes a nit into a comment.
This patch has been contributed back by Sandvine Incorporated.
Please review.

Thanks,
Attilio


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