illumos gate

The problem is that if we have:

root@piano:~# grep console /boot/loader.conf
root@piano:~# grep console /boot/defaults/loader.conf 
console="text,ttya,ttyb,ttyc,ttyd"      # A comma separated list of console(s)
root@piano:~# grep console /boot/solaris/bootenv.rc 
setprop console ttyb

(note: no "os_console") then loader passes in the environment the multi-console value.
We parse that in fakebop, but then over-ride the setting in bootenv.rc.

I don't think the solution to this is to always have bootenv.rc over-ride:
this makes it difficult to fix a mistake there by specifying things in loader.

But, if we see a multi-console setting, it seems reasonable to presume that
the first entry on that list is not necessarily correct, and any bootenv.rc setting
should be preferred.

I tested this with a bunch of variations:

- no entry in bootenv.rc
 - os_console set/unset
 - loader console set to "ttyb", "ttya", "text,ttya,ttyb,ttyc,ttyd"

And confirmed that bootenv.rc ONLY over-rides loader if loader supplied
a multi-console value like the above, and when it does so, the console is as
expected.