config/main: Re-write config files - add to new config v3

- New config format.

```
{
	"version": "3",
	"address": ":9000",
    "backend": {
          "type": "fs",
          "disk": "/path"
    },
	"credential": {
		"accessKey": "WLGDGYAQYIGI833EV05A",
		"secretKey": "BYvgJM101sHngl2uzjXS/OBF/aMxAN06JrJ3qJlF"
	},
	"region": "us-east-1",
	"logger": {
		"file": {
			"enable": false,
			"fileName": "",
			"level": "error"
		},
		"syslog": {
			"enable": false,
			"address": "",
			"level": "debug"
		},
		"console": {
			"enable": true,
			"level": "fatal"
		}
	}
}
```

New command lines in lieu of supporting XL.

Minio initialize filesystem backend.
~~~
$ minio init fs <path>
~~~

Minio initialize XL backend.
~~~
$ minio init xl <url1>...<url16>
~~~

For 'fs' backend it starts the server.
~~~
$ minio server
~~~

For 'xl' backend it waits for servers to join.
~~~
$ minio server
... [PROGRESS BAR] of servers connecting
~~~

Now on other servers execute 'join' and they connect.
~~~
....
minio join <url1> -- from <url2> && minio server
minio join <url1> -- from <url3> && minio server
...
...
minio join <url1> -- from <url16> && minio server
~~~

pkg/fs/fs-bucket-listobjects_test.go

@@ -36,7 +36,7 @@ func TestListObjects(t *testing.T) {
 	defer os.RemoveAll(directory)
 
 	// Create the filesystem.
-	fs, err := New(directory, 0)
+	fs, err := New(directory)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -579,7 +579,7 @@ func BenchmarkListObjects(b *testing.B) {
 	defer os.RemoveAll(directory)
 
 	// Create the filesystem.
-	filesystem, err := New(directory, 0)
+	filesystem, err := New(directory)
 	if err != nil {
 		b.Fatal(err)
 	}