Run `scripts/genproto.sh --skip-protodoc` and checkout
server/wal/walpb/record.pb.go because we still use go.etcd.io/etcd/raft/v3
instead of go.etcd.io/raft/v3.
Before
```
➜ etcd git:(release-3.5) etcdctl put foo bar
OK
➜ etcd git:(release-3.5) etcdctl get -w json foo
{"header":{"cluster_id":14841639068965178418,"member_id":10276657743932975437,"revision":2,"raft_term":2},"kvs":[{"key":"Zm9v","create_revision":2,"mod_revision":2,"version":1,"value":"YmFy"}],"count":1}
➜ etcd git:(release-3.5) etcdctl compact 2
compacted revision 2
➜ etcd git:(release-3.5) http_proxy= curl -L http://127.0.0.1:2379/v3/maintenance/hashkv -X POST -d '{"revsion":2}'
Not Found
```
After
```bash
➜ etcd git:(bp-16464) http_proxy= curl -L http://127.0.0.1:2379/v3/maintenance/hashkv -X POST -d '{"revsion":2}'
{"header":{"cluster_id":"14841639068965178418","member_id":"10276657743932975437","revision":"2","raft_term":"3"},"hash":3305255506,"compact_revision":"2"}%
```
Signed-off-by: Wei Fu <fuweid89@gmail.com>
83bf5dcb20