Updates the __str__ of BaseModel to handle Unicode characters

* Added a case of how to handle if the value is of type unicode
* Changed the logic for the log to use isinstance instead of string comparing the key

Change-Id: I97711e04d789ef6875e571925ddea74fc9ae6da4

cafe/engine/models/base.py

@@ -109,14 +109,18 @@ class BaseModel(object):
 
     def __str__(self):
         strng = '<{0} object> {1}'.format(
-            self.__class__.__name__, self.__REPR_SEPARATOR__)
-        for key in self.__dict__.keys():
-            if str(key) == '_log':
+            type(self).__name__, self.__REPR_SEPARATOR__)
+        for key in vars(self).keys():
+            val = getattr(self, key)
+            if isinstance(val, cclogging.logging.Logger):
                 continue
-            strng = '{0}{1} = {2}{3}'.format(
-                strng, str(key), str(self.__dict__[key]),
-                self.__REPR_SEPARATOR__)
-        return strng
+            elif isinstance(val, unicode):
+                strng = '{0}{1} = {2}{3}'.format(
+                    strng, key, val.encode("utf-8"), self.__REPR_SEPARATOR__)
+            else:
+                strng = '{0}{1} = {2}{3}'.format(
+                    strng, key, val, self.__REPR_SEPARATOR__)
+        return '{0}'.format(strng)
 
     def __repr__(self):
         return self.__str__()