Scenario:
1. Install k8s with Calico network plugin.
2. Run netchecker-server service.
3. Run netchecker-agent daemon set.
4. Get network verification status.
Check status is 'OK'.
New test depends on mcp-netchecker tool. Some
related to network checker stuff was moved and
refactored.
Change-Id: I1f1c85a943a937e11f1e61df046d3c1425dd3643