update dotdict to allow for get of a dotted string

lib/utilities/dot_dict.py

@@ -17,3 +17,27 @@ class DotDict(dict):
             if hasattr(value, 'keys'):
                 value = DotDict(value)
             self[key] = value
+
+    def get(self, key):
+        """get to allow for dot string notation
+        :param str key: Key in dot-notation (e.g. 'foo.lol').
+        :return: value. None if no value was found.
+        """
+        try:
+            return self.__lookup(self, key)
+        except KeyError:
+            return None
+
+    def __lookup(self, dct, key):
+        """Checks dct recursive to find the value for key.
+        Is used by get() interanlly.
+        :param dict dct: input dictionary
+        :param str key: The key we are looking for.
+        :return: The  value.
+        :raise KeyError: If the given key is not found
+        """
+        if '.' in key:
+            key, node = key.split('.', 1)
+            return self.__lookup(dct[key], node)
+        else:
+            return dct[key]