fix a few bugs with app del uninstall and deletion

.pylintrc

@@ -3,3 +3,8 @@
 # List of plugins (as comma separated values of python module names) to load,
 # usually to register additional checkers.
 load-plugins=pylint_flask,pylint_flask_sqlalchemy
+
+# List of class names for which member attributes should not be checked (useful
+# for classes with dynamically set attributes). This supports the use of
+# qualified names.
+ignored-classes=optparse.Values,thread._local,_thread._local,argparse.Namespace,scoped_session