support command line arguments in a configuration file so we can weed master -config=master.conf, weed volume -config=volume.conf and etc.

weed/command/command.go

@@ -1,8 +1,8 @@
 package command
 
 import (
-	"flag"
 	"fmt"
+	flag "github.com/chrislusf/seaweedfs/weed/util/fla9"
 	"os"
 	"strings"
 )

weed/glog/glog_file.go

@@ -20,8 +20,8 @@ package glog
 
 import (
 	"errors"
-	"flag"
 	"fmt"
+	flag "github.com/chrislusf/seaweedfs/weed/util/fla9"
 	"os"
 	"os/user"
 	"path/filepath"

weed/weed.go

@@ -4,8 +4,8 @@
 package main
 
 import (
-	"flag"
 	"fmt"
+	flag "github.com/chrislusf/seaweedfs/weed/util/fla9"
 	"io"
 	"math/rand"
 	"os"