Add list of local council domains

Taken from:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/655371/List_of_.gov.uk_domain_names_as_at_26_October_2017.csv/preview

Then filtered down to councils using this script:
```python
import clipboard
import csv
with open('List_of_.gov.uk_domain_names_as_at_26_October_2017.csv') as l:
    f = csv.reader(l)
    s = ''
    for row in f:
        if 'council' in row[1].lower():
            s = s + "{}:\n    sector: local\n    owner: {}\n".format(*row)
    clipboard.copy(s)
```

tests/app/test_utils.py

@@ -337,6 +337,19 @@ def test_get_valid_government_domain_some_known_details():
     assert government_domain.agreement_signed is True
 
 
+def test_get_valid_government_domain_gets_most_specific_first():
+
+    generic = GovernmentDomain("gov.uk")
+    assert generic.sector is None
+    assert generic.owner is None
+    assert generic.agreement_signed is False
+
+    specific = GovernmentDomain("dacorum.gov.uk")
+    assert specific.sector is None
+    assert specific.owner is None
+    assert specific.agreement_signed is False
+
+
 def test_validate_government_domain_data():
 
     for domain in GovernmentDomain.domains.keys():