Fixed setup script.

scripts/setup-seafile-mysql.py

@@ -107,6 +107,10 @@ Press ENTER to continue
                                     shell=True)
             return proc.wait()
 
+    @staticmethod
+    def get_command_output(args, *a, **kw):
+        return subprocess.check_output(args, *a, **kw)
+
     @staticmethod
     def prepend_env_value(name, value, env=None, seperator=':'):
         '''prepend a new value to a list'''