This reverts commit a3e9e7f89e.
We still have some issues with vhd creation on RAX
In short, it appears that images fail to resize unless they have a
specific "creator" field. Revert this while we consider the options.
[1] https://bugs.launchpad.net/nova/+bug/862653
Change-Id: I2b6a3bfbfe28432fbb6a2ce4a0211939d224b8d5