Use lazy unmount for disorderfs on jenkins.debian.net

[Vagrant Cascadian]

Retrying without the diff, since that got moderated...

Using lazy unmount *might* allow the disorderfs filesystems to unmount
if a file descriptor is held open but later releases... worst case is it
shouldn't make anything worse.

available in "lazy-unmount" branch at:

  https://anonscm.debian.org/git/users/vagrant/jenkins.debian.net.git

live well,
  vagrant
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