esx: set vmfs fs type for vmfs-based datastores
esx: set vmfs fs type for vmfs-based datastores

This way they are correctly represented:
  <source>
    <format type='vmfs'/>
  </source>
... instead of 'auto'.

Signed-off-by: Pino Toscano <7f561d60bf2df812acf624afe597ba9d84c2586d@redhat.com>
Reviewed-by: Cole Robinson <7cd45ff6ad1fb7cf556a02797d774247851499f8@redhat.com>

libvirt/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,nertpinx/libvirt,jardasgit/libvirt,nertpinx/libvirt,zippy2/libvirt,jfehlig/libvirt,olafhering/libvirt,jardasgit/libvirt,nertpinx/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,crobinso/libvirt,fabianfreyer/libvirt,crobinso/libvirt,jfehlig/libvirt,nertpinx/libvirt,olafhering/libvirt,jardasgit/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zippy2/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,olafhering/libvirt,libvirt/libvirt,libvirt/libvirt,jardasgit/libvirt,crobinso/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,zippy2/libvirt