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/service/test_rest.py

@@ -203,7 +203,14 @@ def test_get_service_list_has_default_permissions(client, service_factory):
     assert response.status_code == 200
     json_resp = json.loads(response.get_data(as_text=True))
     assert len(json_resp['data']) == 3
-    assert all([set(json['permissions']) == set([EMAIL_TYPE, SMS_TYPE]) for json in json_resp['data']])
+    assert all(
+        set(
+            json['permissions']
+        ) == set([
+            EMAIL_TYPE, SMS_TYPE, INTERNATIONAL_SMS_TYPE,
+        ])
+        for json in json_resp['data']
+    )
 
 
 def test_get_service_by_id_has_default_service_permissions(client, sample_service):
@@ -214,7 +221,11 @@ def test_get_service_by_id_has_default_service_permissions(client, sample_servic
     )
     json_resp = json.loads(resp.get_data(as_text=True))
 
-    assert set(json_resp['data']['permissions']) == set([EMAIL_TYPE, SMS_TYPE])
+    assert set(
+        json_resp['data']['permissions']
+    ) == set([
+        EMAIL_TYPE, SMS_TYPE, INTERNATIONAL_SMS_TYPE,
+    ])
 
 
 def test_get_service_by_id_should_404_if_no_service(notify_api, notify_db):