[RFE] introduce integration tests

[ingvagabund]

Build fake cluster to test the implementation.Run the tests over each PR via Travis.

We can fake nodes and other resources. Check https://github.com/ingvagabund/node-auto-repair/blob/master/main.go#L437 for a fake client set.

Currently, the fake client set does not emulate the Patch request: kubernetes/client-go#364.

TPB