Convert domain list to YAML

YAML is easier to edit than Python code, and having it in the root
directory of the app makes it nice and easy to find.

tests/app/test_utils.py

@@ -335,3 +335,26 @@ def test_get_valid_government_domain_some_known_details():
     assert government_domain.sector is None
     assert government_domain.owner == "Marine Management Organisation"
     assert government_domain.agreement_signed is False
+
+
+def test_validate_government_domain_data():
+
+    for domain in GovernmentDomain.domains.keys():
+
+        government_domain = GovernmentDomain(domain)
+
+        assert government_domain.sector in {
+            'local', 'central', None
+        }
+
+        assert (
+            government_domain.owner is None
+        ) or (
+            isinstance(government_domain.owner, str)
+        )
+
+        assert (
+            government_domain.agreement_signed is True
+        ) or (
+            government_domain.agreement_signed is False
+        )