v3.6.14
re-generate api/etcdserverpb/gw/rpc.pb.gw.go
re-generate all the *.pb.gw.go files
upgrade grpc-gateway from v1 to v2
Add DowngradeVersionTestRequest as a field into InternalRaftRequest
api: address revive unexported-return issues
fix: use testify instead of t.Fatal or t.Error in api package
etcdserver: Fixing minor typos in v3election.proto and rpc.proto