fix test shim

Author: zeryx

tests/AdkTest.py

@@ -1,7 +1,7 @@
 from adk import ADK
-
+from adk.modeldata import ModelData
 
 class ADKTest(ADK):
     def __init__(self, apply_func, load_func=None, client=None, manifest_path="model_manifest.json.freeze"):
         super(ADKTest, self).__init__(apply_func, load_func, client)
-        self.model_data = self.init_manifest(manifest_path)
+        self.model_data = ModelData(self.client, manifest_path)