Use etcd 3.4 client

[justinsb]

3.5 seems to have regressed on kubernetes/kubernetes#72102

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[justinsb]

/test cluster-create-phases-test

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[hakman]

/lgtm
/hold in case there's something missing

[justinsb]

This is looking good I think ... 3.4 is passing, 3.5 is failing only on the test which shows the regression. Going to merge this one.

/hold cancel