Corrected url names in ganetiviz urls.

Refs #13569
Ganetiviz - Most instance specific data loaded via ajax on demand ie. when an instance is clicked on.
(Some instance data however is fetched with the cluster data itself in the beginning.)
Todo: Need to update ClusterJsonView to discard some instance data provided on demand
      by gwm-rapi proxy view to eliminate any redundant data transfer

Refs #13569
Removed redundant vm fields returned via ClusterJsonView, in ganetiviz
The removed fields are available on demand from another instance based endpoint /ganetiviz/(clutser-name)/(instance-hostname)

Refs #13569
Removed url endpoints pointing to outmoded views in ganetiviz.
These outmoded views have been commented out, as they may be useful in future.

Refs #13569