zfs pool devices detection in core/osdep/unix/getroot.c

[Toomas Soome]

hi!

this update is written by Richard Yao <address@hidden> and is addressing the 
issue that device names are not correctly discovered in more complex pool 
setups. This code walks over pool vdev list and will collect device names from 
vdev children, ensuring the all device names will be presented to caller.

Since Richard has been busy, Im posting this update on his behalf and based on 
fact that the code is been quite extensively tested by me and few other people 
anyhow:) 

rgds,
toomas

getroot.diff
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