Test for vnf requirement R-35851

Test for vnf requirement R-35851

Implement test for vnf requirement R-35851: The VNF Package MUST include
VNF topology that describes basic network and application connectivity
internal and external to the VNF including Link type, KPIs, Bandwidth,
latency, jitter, QoS (if applicable) for each interface.

For now, we only check the existence of CP or VL, because Link type,
bandwidth are already foced by ONAP DM. For other KPIs, current onap DM
doesn't define yet.

Change-Id: I6ad78edfcbd96ef748e1dbe5f0674b6e4e537e06
Issue-ID: VNFSDK-314
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>