Automatic merge from submit-queue

Add validation for affinities and taints/tolerations annotations.

It fixes annotations validation issues for pod/node affinities and taints/tolerations annotations for 1.5 to 1.6 upgrade tests as discussed in the issue https://github.com/kubernetes/kubernetes/issues/43228 .

@davidopp @derekwaynecarr @kubernetes/sig-scheduling-pr-reviews