Make international SMS on for new services

International SMS is a mature, documented feature now. There’s no reason
it shouldn’t be available to everyone. If it’s turned off by default
then we’re relying on people finding it in the settings page to know
that it exists (which we found in research the other week that users,
who would have benefitted from having international SMS, were failing to
do).

This also fixes the problem whereby users signing up for Notify with an
international phone number (eg those working abroad for the Foreign and
Commonwealth Office) couldn’t get through the tour because they weren’t
able to send themselves the example text message (see
https://www.pivotaltracker.com/story/show/150705515).

tests/app/notifications/test_validators.py

@@ -310,9 +310,14 @@ def test_should_not_rate_limit_if_limiting_is_disabled(
 
 
 @pytest.mark.parametrize('key_type', ['test', 'normal'])
-def test_rejects_api_calls_with_international_numbers_if_service_does_not_allow_int_sms(sample_service, key_type):
+def test_rejects_api_calls_with_international_numbers_if_service_does_not_allow_int_sms(
+    key_type,
+    notify_db,
+    notify_db_session,
+):
+    service = create_service(notify_db, notify_db_session, permissions=[SMS_TYPE])
     with pytest.raises(BadRequestError) as e:
-        validate_and_format_recipient('20-12-1234-1234', key_type, sample_service, SMS_TYPE)
+        validate_and_format_recipient('20-12-1234-1234', key_type, service, SMS_TYPE)
     assert e.value.status_code == 400
     assert e.value.message == 'Cannot send to international mobile numbers'
     assert e.value.fields == []