MFC: r197542:

MFC: r197542:
  - When we run our trap cleanup handler, echo that we are running this
    handler to make it more clear why we are 'suddenly' running df,
    umount, and mdconfig.
  - Remove trap handler again after we have unconfigured the memory
    device etc.  Before we could end up running the trap handler if a
    later stage failed, which was a bit confusing and not really useful.
  MFC after:      2 weeks

git-svn-id: svn://svn.freebsd.org/base/stable/8@206030 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f