Medium: ticket: start election if the ticket was granted to us (bnc#873400)
Medium: raft: expire tickets on no heartbeat acks (bnc#873483)
Medium: raft: don't broadcast req_vote twice on ticket grant
Medium: raft: increment the term on new election when ticket lost (bnc#873643)
Medium: raft: no vote on revoked tickets (bnc#872918)
Medium: raft: reset ticket expiry when following another leader
Medium: ticket: write ticket to CIB on revoke
Dev: ticket: amend 270f9e to really update the CIB