smoke test: specifying etcdctl API version no longer needed

current versions of etcdctl (such as 3.4.10) default to API  verison 3:
```
VERSION: 3.4.10
API VERSION: 3.4 
```
pull/635/head
axel simon 2021-02-17 17:29:56 +00:00 committed by GitHub
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commit 47ec808d6f
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@ -17,7 +17,7 @@ Print a hexdump of the `kubernetes-the-hard-way` secret stored in etcd:
``` ```
gcloud compute ssh controller-0 \ gcloud compute ssh controller-0 \
--command "sudo ETCDCTL_API=3 etcdctl get \ --command "sudo etcdctl get \
--endpoints=https://127.0.0.1:2379 \ --endpoints=https://127.0.0.1:2379 \
--cacert=/etc/etcd/ca.pem \ --cacert=/etc/etcd/ca.pem \
--cert=/etc/etcd/kubernetes.pem \ --cert=/etc/etcd/kubernetes.pem \