distributed-XL: Support to run one minio process per export even on the same machine. (#2999)

fixes #2983

cmd/globals.go

@@ -57,6 +57,8 @@ var (
 	globalMinioAddr = ""
 	// Minio default port, can be changed through command line.
 	globalMinioPort = 9000
+	// Holds the host that was passed using --address
+	globalMinioHost = ""
 	// Peer communication struct
 	globalS3Peers = s3Peers{}