Upgrade golangci-lint to v1.17.1

[corneliusweig]

And fix new reported issues

[nkubala]

ah, can you run ./hack/check-docs.sh

[corneliusweig]

@nkubala Whoops sorry. Should have thought about that.

I think the travis run has hit some data-race which has nothing to do with these changes.

[balopat]

yupp, this fixes it: #2251
The problem was at

....
			for _, phase := range test.phases {
				if fakeWatcher.IsStopped() {
					break
				}

                                /// at this point fakeWatcher could stop and 
                               /// Modify then tried to send a message to a closed channel

				fakeWatcher.Modify(&v1.Pod{
					Status: v1.PodStatus{
						Phase: phase,
					},
				})
				time.Sleep(time.Second)
			}
....				

[balopat]

LGTM, thank you!

[corneliusweig]

I merged master to get a clean travis build.

Doc was updated