TST: Cleaned up test references to adjustments db

If we don't clean them up, then windows can delete
the temp dir with the db.

tests/test_api_shim.py

@@ -164,6 +164,11 @@ class TestAPIShim(TestCase):
             env=cls.env
         )
 
+    @classmethod
+    def tearDownClass(cls):
+        del cls.adj_reader
+        cls.tempdir.cleanup()
+
     @classmethod
     def build_daily_data(cls):
         path = cls.tempdir.getpath("testdaily.bcolz")
@@ -217,10 +222,6 @@ class TestAPIShim(TestCase):
 
         return SQLiteAdjustmentReader(path)
 
-    @classmethod
-    def tearDownClass(cls):
-        cls.tempdir.cleanup()
-
     def setUp(self):
         self.data_portal = DataPortal(
             self.env,
@@ -229,6 +230,9 @@ class TestAPIShim(TestCase):
             adjustment_reader=self.adj_reader
         )
 
+    def tearDown(self):
+        del self.data_portal
+
     @classmethod
     def create_algo(cls, code, filename=None, sim_params=None):
         if sim_params is None: