Updated openstack/openstack
Project: openstack/cinder  9bd7ca7f26fc5ebf951a9d3856df380a3f8c894d

Enhance docstring for iscsi_helper

The helptext for the iscsi_helper option did not mention the
potential to use lioadm (or fake). This patch simply amends
the text so this functionality is more discoverable.

Change-Id: I4bf4a6f77191a7f42d5b38f71759944e4997ccc6