implement __lt__ and __eq__ to support sorting a list of types

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

lib/cdist/core/type.py

@@ -86,6 +86,12 @@ class Type(object):
     def __repr__(self):
         return '<Type %s>' % self.name
 
+    def __eq__(self, other):
+        return isinstance(other, self.__class__) and self.name == other.name
+
+    def __lt__(self, other):
+        return isinstance(other, self.__class__) and self.name < other.name
+
     @property
     def is_singleton(self):
         """Check whether a type is a singleton."""