raft: remove unused raftpb.LastIndex
Merge pull request #1085 from unihorn/127

raft: remove unused raftpb.LastIndex
Merge pull request #1061 from jonboulle/server_interface

etcdserver: introduce Server interface
etcdserver/etcdhttp: add test coverage for serveRaft
etcdserver: rename fakeServer to errServer
etcdserver: change raft endpoint to send StatusNoContent