lib: add SentryIgnoredException, to easily ignore exceptions from sentry

passbook/policies/exceptions.py

@@ -1,5 +1,6 @@
 """policy exceptions"""
+from passbook.lib.sentry import SentryIgnoredException
 
 
-class PolicyException(Exception):
+class PolicyException(SentryIgnoredException):
     """Exception that should be raised during Policy Evaluation, and can be recovered from."""