Bug 2108: Fix for editing polices in VNFD

Added fix for extracting policies from VNFD

Change-Id: I7bb55f32c4e5524030f92a0afed920e003a764bf
Signed-off-by: elumalai <deepika.e@tataelxsi.co.in>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>