operator: remove empty JointConsensus steps and fix single voter demote bug#4534

Merged

ti-chi-bot merged 6 commits intotikv:masterfrom matchge-ca:schedule-remove-empty-jointconcensus-steps

Jan 6, 2022

+164-189

Commits on Jan 3, 2022

remove empty jc steps and fix single peer demote bug
matchge-ca
committed

Commits on Jan 4, 2022

remove DemoteFollower from builder, step and operator_controller, and improve code quality
matchge-ca
committed
Merge branch 'master' into schedule-remove-empty-jointconcensus-steps
matchge-ca
committed
change leave step condition to cover rare case
matchge-ca
committed

Commits on Jan 5, 2022