Move tardirs=, vnddirs=, and mfsdirs= to etc/rc.flashrd.sub, for both
runtime usage (/etc/rc) and for image creation (flashrd/cfgflashrd) usage.

This way we have one place to change variables, not many. There is another
copy of vnddirs= in stand/rc, and this has to remain. RC notes are adjusted.

Also, put flashrd-specific init stuff in own rc.flashrd.* config files. Call
those from example rc.{conf.local,local,shutdown} files. That way, upgrades
through onetime.tgz can include one line in rc.{conf.local,local,shutdown}
and get the full flashrd upgrade with no manual merging of any data. This
is simply an extension of what was done in the last few commits.
Copy new files to image and proper printing for error line tmpdir
reverse think-o
Stop lying. Better notes on what variables are important where and when.
flashrd 1.3
and even more explicit definition of flashrd variable usage,
mainly defined in etc/rc.flashrd.sub