webui: Add useless backend header in single-backend mode
Validate that each backend has the proper attributes for the driver
Integrated Fujitsu ETERNUS DX (fate#317486)

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
Minor cleanup
Fix crash because of reference to resource not existing yet
Fix crash in cinder.conf template
Support for VMWare integration
Merge pull request #201 from vuntz/multi_backend-improvements

Minor improvements to multi-backend support
Merge pull request #202 from vuntz/fujitsu-eternus

Integrated Fujitsu ETERNUS DX & VMware
Synchronize cinder.conf template with Icehouse

There's no functional change yet.

Note that some new options for NetApp were not added yet (so are still
in the diff) because we need to figure out if we care about them. These
are:
  netapp_webservice_path
  netapp_controller_ips
  netapp_sa_password
  netapp_storage_pools
  netapp_copyoffload_tool_path