truncate os.Hostname if lengther than 60

add mutiple uuid set of mysql

Author: jianhaiqing

dump/dump_test.go

@@ -32,7 +32,7 @@ var _ = Suite(&schemaTestSuite{})
 
 func (s *schemaTestSuite) SetUpSuite(c *C) {
 	var err error
-	s.conn, err = client.Connect(fmt.Sprintf("%s:%d", *host, *port), "root", "root", "")
+	s.conn, err = client.Connect(fmt.Sprintf("%s:%d", *host, *port), "root", "", "")
 	c.Assert(err, IsNil)
 
 	s.d, err = NewDumper(*execution, fmt.Sprintf("%s:%d", *host, *port), "root", "")