Change services.id to a UUID

Ideally all the primary keys in the db would be UUID in order to guarantee unique ids across distributed dbs.
This updates the services.id to a UUID. All the tables with a foreign key to the services.id are also updated.
The endpoints no longer state a data type of the <service_id> path param.
All the tests are updated to reflect this update.

The thing to pay attention to is the 0011_uuid_service_id.py migration script.
This commit must go with a commit on the notifications_admin app to keep things working.
There will be a small outage until both deploys have happened.

tests/app/conftest.py

@@ -78,8 +78,7 @@ def sample_service(notify_db,
         'users': [user],
         'limit': 1000,
         'active': False,
-        'restricted': False,
-        'queue_name': str(uuid.uuid4())}
+        'restricted': False}
     service = Service.query.filter_by(name=service_name).first()
     if not service:
         service = Service(**data)