o Allow side-stepping flock(1) if not installed for rc script
o Pass arguments to subroutine script to allow passing modes
o Print a busy message when e.g. the GUI is running the upgrade
We do not want to have rc.firmware use the other scripts for
a number of reasons...
* Don't jump through configd in case it's dysfunct
* Don't use the normal script in case it's gone
* tee(1) output so that the console works as usual
Make "src" the implicit "/usr/local" so that nobody can
sneak in weird files in the base file system or potentially
overwrite them.
This is the last time, I swear... :)
