Also a couple perf hacks:

* Local vnodes can start with the password/group file from the
  physnode, since locally they will be the same anyway. This avoids a
  blizzard of accounts requests at startup, which is by far the
  biggest chunk of data returned (well, except for host tables).

* To help serialize boot startup, vnodesetup now waits for the jail to
  finish starting up before it exits. It does this via a "goofy"
  mechanism I will not bother to describe.