Update snmp_ee_vnf to specify helm chart v2

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

snmp_ee_vnf/snmp_ee_vnfd.yaml

@@ -77,6 +77,7 @@ vnfd:
     execution-environment-list:
     - connection-point-ref: vnf-mgmt
       helm-chart: eechart
+      helm-version: v2
       id: monitor
       metric-service: snmpexporter
     id: default-vnf-configuration