Update pb and handle pkg util import

[absolute8511]

use gofast for protobuf and avoid reference directly in etcd pkgs.

[codecov]

Codecov Report

Merging #35 into master will increase coverage by 0.33%.
The diff coverage is 49.52%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
+ Coverage   47.87%   48.21%   +0.33%     
==========================================
  Files         103      142      +39     
  Lines       17641    19178    +1537     
==========================================
+ Hits         8446     9247     +801     
- Misses       7815     8449     +634     
- Partials     1380     1482     +102

Impacted Files	Coverage Δ
transport/rafthttp/peer_status.go	71.42% <ø> (ø)	⬆️
wal/repair.go	48% <ø> (ø)	⬆️
node/raft.go	40% <ø> (-0.1%)	⬇️
snap/db.go	0% <ø> (ø)	⬆️
transport/rafthttp/msgappv2_codec.go	66.41% <ø> (ø)	⬆️
transport/rafthttp/util.go	72.83% <ø> (ø)	⬆️
transport/rafthttp/stream.go	80.13% <ø> (ø)	⬆️
transport/rafthttp/msg_codec.go	87.5% <ø> (ø)	⬆️
wal/file_pipeline.go	75% <ø> (ø)	⬆️
snap/snapshotter.go	67.34% <ø> (ø)	⬆️
... and 102 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 511e702...2544c6e. Read the comment docs.