Automatic merge from submit-queue (batch tested with PRs 62324, 61459, 62475, 62476, 61914). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

etcdv3 client: add dial timeout

dial timeout is necessary for a reliable system, this pr add it for establishing an etcd connection.

**Release note**:

```release-note
NONE
```