Comment 3 for bug 1188972

Reviewed: https://review.openstack.org/32538
Committed: http://github.com/openstack/cinder/commit/2ee2a19eb542c08ccd99766e1a6ccee87f427592
Submitter: Jenkins
Branch: master

commit 2ee2a19eb542c08ccd99766e1a6ccee87f427592
Author: Haomai Wang <email address hidden>
Date: Tue Jun 11 16:36:42 2013 +0800

    Fix some unittest cases failed on osx

    dd shouldn't actually be called in the unit tests to begin with. Stub these
    improper calls out.

    Fixes bug: 1188972

    Change-Id: I2966382a66eebbf49ce74e091e444a91ab274869