zfs mount prior to rc.conf evaluations

[Sean Bruno]

We have a few slightly goofy rc.conf variables that require /usr/bin/ to
be mounted before rc.conf is evaluated, e.g:

netwait_ip="$(grep default /etc/start_if.* | awk '{print $4}')"

This worked in our UFS world, but in ZFS land with zroot/usr/bin being a
seperate mountpoint, its not mounted at the point that rc.conf is
evaluated causing a few things to fail.

This appears to be solved by applying
http://www.freebsd.org/cgi/query-pr.cgi?pr=153666

But, is there a better way to do this?  I *could* make zroot/usr and
zroot/usr/bin just be part of zroot and not seperate mountpoints to
solve the issue as well.

Thoughts or alternative solutions?

Sean
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