Fix in netslice-vld instantiation parameters: wrong connection point refs

Updated License headers
Refactoring netslice-instantion-params to an independent file to enable proper import
Removed vlr-ref-list and added vlr-list in nsi to actually represent the record in DB

Change-Id: Ia1388b103686b829bf6dc18cdf21eb5e7058f975
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>