Piotr Tabor 0d9cfc11c8 Fix usage of reflect.SliceHeader: reported by vet on tip golang
Example:
https://travis-ci.com/github/etcd-io/etcd/jobs/470404938

```
% (cd server && go vet ./...)
stderr: # go.etcd.io/etcd/server/v3/etcdserver/api/v2store
stderr: etcdserver/api/v2store/node_extern_test.go:107:9: possible misuse of reflect.SliceHeader
stderr: etcdserver/api/v2store/node_extern_test.go:107:16: possible misuse of reflect.SliceHeader
```
2021-01-12 00:14:51 +01:00
..
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