Integrated Fujitsu ETERNUS DX (fate#317486)

**An upstream followup pull request of https://github.com/SUSE-Cloud/barclamp-cinder/pull/1**

In order to get Fujitsu ETERNUS DX volume types working a have
integrated the configuration for it to reflect the patch included into
our SUSE packages.

This fixes the request https://fate.suse.com/317486
Added ```cinder.volume.drivers.fujitsu.fujitsu_eternus_dx_iscsi.FJDXISCSIDriver```