Emualated the validation methods that exist [in the python-client](620e5f7014/integration_test/__init__.py).
The `validate_v0` function loads json schemas from a local
`/schemas` directory, whereas the new `validate` function (which
we're going to use for our v2 API calls) uses the common
`get_notification_response` python schema defined in
"app/v2/notifications/notification_schemas.py".
Removed the new `v2` schema from the last commit as it's no longer
being used.
Also, refactored common code in the GET and POST contract files
so that making requests and converting responses to JSON are
pulled out into common functions.
Converted python-based schema in
"app/v2/notifications/notification_schema.py" into a pure json
schema and tested it with the new "v2/" API route to confirm that
it validates.
Also refactored some common code in the public contract GET tests
that returns notifications.
