SlapTool: Only convert to string if value ins't an unicode value

master/product/Vifib/Tool/SlapTool.py

@@ -1211,8 +1211,10 @@ class SlapTool(BaseTool):
                                               connection_xml)
     instance = etree.Element('instance')
     for parameter_id, parameter_value in partition_parameter_kw.iteritems():
+      if not isinstance(parameter_value, unicode):
+        parameter_value = str(parameter_value)
       etree.SubElement(instance, "parameter",
-                       attrib={'id':parameter_id}).text = str(parameter_value)
+                       attrib={'id':parameter_id}).text = parameter_value
     connection_xml = etree.tostring(instance, pretty_print=True,
                                   xml_declaration=True, encoding='utf-8')
     reference = software_instance.getReference()