blucon needs to run container with --net=host

When running a conformance test for k8s in our KNI projects, we need to have dns to resolve our endpoint (not an ip, it's https://api.community.kni.home:6443 ).
As the container for the tests is not run with --net=host, it cannot resolve this address. So this flag needs to be passed (either mandatory, or make it optional and be able to configure it)