brings in a fix to InvalidEmail/Phone/AddressExceptions not being
instantiated correctly. `exception.message` is not a python standard,
so we shouldn't be relying on it to transmit exception reasons -
rather we should be using `str(exception)` instead. This involved a
handful of small changes to the schema validation
If the notification has a status == sending then update the status otherwise do not update the status.
In other words do not change the status more than once.
- when a provider callback occurs and we update the status of the notification, also update the statistics table
Adds:
- Mapping object to the clients to handle mapping to various states from the response codes, this replaces the map.
- query lookup in the DAO to get the query based on response type / template type
Tests around rest class and dao to check correct updating of stats
Missing:
- multiple client callbacks will keep incrementing the counts of success/failure. This edge case needs to be handle in a future story.
