Comment 2 for bug 1178091

Reviewed: https://review.openstack.org/28687
Committed: http://github.com/stackforge/diskimage-builder/commit/20661e8d8070c034bbc962feeb15b72d710dee5d
Submitter: Jenkins
Branch: master

commit 20661e8d8070c034bbc962feeb15b72d710dee5d
Author: Clint Byrum <email address hidden>
Date: Thu May 9 09:34:53 2013 -0700

    Retry losetup -d for up to 10 seconds.

    When partition tables are added to loopback devices, this can set off a
    chain of udev hooks that may still be holding the loopback open. Failing
    to detach loopback devices was the reason we were seeing leaked tmpfs
    volumes.

    Fixes bug #1178091

    Change-Id: I836d6e2bbce824951dd4786e3ef28273ea18ee73