Change endpoint responses where there are marshalling, unmarshalling

or param errors to raise invalid data exception. That will cause
those responses to be handled in by errors.py, which will log
the errors.

Set most of schemas to strict mode so that marshmallow will raise
exception rather than checking for errors in return tuple from load.

Added handler to errors.py for marshmallow validation errors.

app/accept_invite/rest.py

@@ -10,7 +10,11 @@ from notifications_utils.url_safe_token import check_token
 
 from app.dao.invited_user_dao import get_invited_user_by_id
 
-from app.errors import register_errors
+from app.errors import (
+    register_errors,
+    InvalidRequest
+)
+
 from app.schemas import invited_user_schema
 
 
@@ -30,7 +34,8 @@ def get_invited_user_by_token(token):
                                       max_age_seconds)
     except SignatureExpired:
         message = 'Invitation with id {} expired'.format(invited_user_id)
-        return jsonify(result='error', message=message), 400
+        errors = {'invitation': [message]}
+        raise InvalidRequest(errors, status_code=400)
 
     invited_user = get_invited_user_by_id(invited_user_id)