Change config structure so allowances are dated

We’re going to have different allowances next financial year. This means
that when someone adds a service, we’ll need to check which year it is,
so we can give them the right allowance.

This commit changes the config structure so that the current allowances
are explicitly assigned to the 2020/21 financial year.

It freezes the tests to the 2020/21 financial year, so they won’t start
failing automatically when next financial year comes around.

tests/app/main/views/test_add_service.py

@@ -1,5 +1,6 @@
 import pytest
 from flask import session, url_for
+from freezegun import freeze_time
 from notifications_python_client.errors import HTTPError
 
 from app.utils import is_gov_user
@@ -116,6 +117,7 @@ def test_show_different_page_if_user_org_type_is_local(
     ('other', None, 'other', 25000),
     ('central', 'local', 'central', 250000),
 ))
+@freeze_time("2021-01-01")
 def test_should_add_service_and_redirect_to_tour_when_no_services(
     mocker,
     client_request,
@@ -239,14 +241,14 @@ def test_get_should_only_show_nhs_org_types_radios_if_user_has_nhs_email(
     ]
 
 
-@pytest.mark.parametrize('organisation_type, free_allowance', [
-    ('central', 250 * 1000),
-    ('local', 25 * 1000),
-    ('nhs_central', 250 * 1000),
-    ('nhs_local', 25 * 1000),
-    ('school_or_college', 25 * 1000),
-    ('emergency_service', 25 * 1000),
-    ('other', 25 * 1000),
+@pytest.mark.parametrize('financial_year, organisation_type, free_allowance', [
+    (2020, 'central', 250 * 1000),
+    (2020, 'local', 25 * 1000),
+    (2020, 'nhs_central', 250 * 1000),
+    (2020, 'nhs_local', 25 * 1000),
+    (2020, 'school_or_college', 25 * 1000),
+    (2020, 'emergency_service', 25 * 1000),
+    (2020, 'other', 25 * 1000),
 ])
 def test_should_add_service_and_redirect_to_dashboard_when_existing_service(
     app_,
@@ -261,7 +263,13 @@ def test_should_add_service_and_redirect_to_dashboard_when_existing_service(
     free_allowance,
     mock_create_or_update_free_sms_fragment_limit,
     mock_get_all_email_branding,
+    financial_year,
 ):
+    mocker.patch(
+        'app.main.views.add_service.get_current_financial_year',
+        return_value=financial_year,
+    )
+
     client_request.post(
         'main.add_service',
         _data={
@@ -308,6 +316,7 @@ def test_add_service_fails_if_service_name_fails_validation(
     assert error_message in page.find("span", {"class": "govuk-error-message"}).text
 
 
+@freeze_time("2021-01-01")
 def test_should_return_form_errors_with_duplicate_service_name_regardless_of_case(
     client_request,
     mock_get_organisation_by_domain,