randomize raft server startup

also some go fmt

weed/command/benchmark.go

@@ -2,6 +2,7 @@ package command
 
 import (
 	"bufio"
+	"context"
 	"fmt"
 	"io"
 	"math"
@@ -19,7 +20,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
-	"context"
 )
 
 type BenchmarkOptions struct {

weed/command/master.go

@@ -132,7 +132,7 @@ func checkPeers(masterIp string, masterPort int, peers string) (masterAddress st
 	if !hasSelf {
 		peerCount += 1
 	}
-	if peerCount %2 == 0 {
+	if peerCount%2 == 0 {
 		glog.Fatalf("Only odd number of masters are supported!")
 	}
 	return