zalando-incubator / postgres-operator / 1076

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Remove team from statefulset selector (#271)

* Remove 'team' label from the statefulset selector.

I was never supposed to be there, but implicitely statefulset
creates a selector out of meta.labels field. That is the problem
with recent Kubernetes, since statefulset cannot pick up pods
with non-matching label selectors, and we rely on statefulset
picking up old pods after statefulset replacement.

Make sure selector changes trigger replacement of the statefulset.

In the case new selector has more labels than the old one nothing
should be done with a statefulset, otherwise the new statefulset
won't see orphaned pods from the old one, as they won't match the
selector. 

See https://github.com/kubernetes/kubernetes/issues/46901#issuecomment-356418393

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