Add a pull_apk method in AppInstaller. Pulls APK file from device given package name

Bug: None
Test: local
Change-Id: I35704a59d2eac9e73dcccd632a3b2df7c8c61a39
diff --git a/acts/framework/tests/test_utils/instrumentation/instrumentation_base_test_test.py b/acts/framework/tests/test_utils/instrumentation/instrumentation_base_test_test.py
index a5eef3f..04ac8e8 100755
--- a/acts/framework/tests/test_utils/instrumentation/instrumentation_base_test_test.py
+++ b/acts/framework/tests/test_utils/instrumentation/instrumentation_base_test_test.py
@@ -56,6 +56,8 @@
         self.current_test_name = None
         self._instrumentation_config = ConfigWrapper(
             MOCK_INSTRUMENTATION_CONFIG)
+        self._class_config = self._instrumentation_config.get_config(
+            self.__class__.__name__)
 
 
 class InstrumentationBaseTestTest(unittest.TestCase):