cmd-forwarder-vpp should not depend on sdk-k8s

[denis-tingaikin]

https://github.com/networkservicemesh/cmd-forwarder-vpp/blob/main/go.mod#L18
cmd-forwarder-vpp was not designed to use sdk-k8s.
we should refactor code and get rid of using sdk-k8s dep in cmd-forwarder-vpp.