kubernetes test

Add functional tests for namespaces

Fix type for ovs interface that could be updated by netlink probe
leading in inconsistency.

Fixes a race when stopping/unregistering

Change-Id: I0ec87418ab30450f78fa6e4c5756aaacf795ef40

v0.2.0: Merge pull request #63 from safchain/mapping_fix

Fix probePath mapping, refactor test helpers add functional test