port etcd joint consensus #378
Description
We have developed ours implementation but as discussed in the past, we decided to go with the community and port the implement of etcd instead.
There will be several PRs:
- raft: use half-populated joint quorum etcd-io/etcd#10779
- raft: centralize configuration change application etcd-io/etcd#10865
- raft: never remove the last voter etcd-io/etcd#10884
- raft: internally support joint consensus etcd-io/etcd#10889
- raft: allow use of joint quorums etcd-io/etcd#10914
- raft: fix restoring joint configurations etcd-io/etcd#11003
- raft/rafttest: introduce datadriven testing etcd-io/etcd#11005
- raft: fix auto-transitioning out of joint config etcd-io/etcd#11046
The PRs doesn't have to be picked one by one. And we probably sync the code with upstream first.