Revert "Adds passthrough config for cinder rootwra

This reverts commit 908a9f5dfe4d7174612c37a59b2a7fb4bb30fd68.

This config file is empty by default and breaks the ability
to create cinder volumes with the following error from
oslo.rootwrap:

  No section: \'Filters\'\n'

Change-Id: I28c62fedc372c57e86566270b7e1e99b82a921a4
Closes-bug: #1342101
Merge "Revert "Adds passthrough config for cinder rootwra"