raft: remove vote with default value

raft/node_test.go

@@ -14,12 +14,12 @@ func TestNode(t *testing.T) {
 
 	wants := []Ready{
 		{
-			State:            raftpb.State{Term: 1, Vote: none, Commit: 1, LastIndex: 1},
+			State:            raftpb.State{Term: 1, Commit: 1, LastIndex: 1},
 			Entries:          []raftpb.Entry{{Term: 1, Index: 1}},
 			CommittedEntries: []raftpb.Entry{{Term: 1, Index: 1}},
 		},
 		{
-			State:            raftpb.State{Term: 1, Vote: none, Commit: 2, LastIndex: 2},
+			State:            raftpb.State{Term: 1, Commit: 2, LastIndex: 2},
 			Entries:          []raftpb.Entry{{Term: 1, Index: 2, Data: []byte("foo")}},
 			CommittedEntries: []raftpb.Entry{{Term: 1, Index: 2, Data: []byte("foo")}},
 		},
@@ -48,7 +48,7 @@ func TestNodeRestart(t *testing.T) {
 		{Term: 1, Index: 1},
 		{Term: 1, Index: 2, Data: []byte("foo")},
 	}
-	st := raftpb.State{Term: 1, Vote: none, Commit: 1, LastIndex: 2}
+	st := raftpb.State{Term: 1, Commit: 1, LastIndex: 2}
 
 	want := Ready{
 		State: emptyState,