Reproduce --wait-cluster-ready-timeout flag causing linearizability issue

[serathius]

Reproduces #16666 but finds that --wait-cluster-ready-timeout could even cause linearizability issue in single node cluster.

[serathius]

Revision is goes back by 1, for couple of requests and then it is restored. Consistent with predictions in #16666

Think this is combination of 2 issues, #16666 and I expect that in single node clusters, leader trusts it's own db state and doesn't check readIndex, which during bootstrap can be newer then db state.

[ahrtr]

Please integrate etcd-io/raft#105 and try again.

[serathius]

Will do, however I think the etcd-io/raft#105 is not a proper solution. I expect it will fix the issue, but I don't think the approach is correct. Responsed on PR with my thoughts.

[k8s-ci-robot]

@serathius: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-verify	6edc12a	link	true	/test pull-etcd-verify

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