Better __repr__() for data model

This greatly enhances debugability of data model objects as repr() and
str() of objects contain now all attributes.

TODO: Check for secret attributes
Change-Id: I2babd600516cfe98673627c68e97cb581ee54834

octavia_lib/api/drivers/data_models.py

@@ -76,6 +76,11 @@ class BaseDataModel():
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def __repr__(self):
+        attrs = " ".join(
+            "{}={!r}".format(k, v) for k, v in self.__dict__.items())
+        return f"{self.__class__.__name__}({attrs})"
+
     @classmethod
     def from_dict(cls, dict):
         return cls(**dict)