Don’t allow suppliers to sign up for own accounts

Suppliers need to be invited by people who work for the government.
People who work for the government can invite anyone to join their team,
no matter what their email address is.

So there’s no need for these domains to be in the list now.

config.py

@@ -61,13 +61,7 @@ class Config(object):
         r"nhs\.uk",
         r"nhs\.net",
         r"police\.uk",
-        r"kainos\.com",
-        r"salesforce\.com",
-        r"bitzesty\.com",
         r"dclgdatamart\.co\.uk",
-        r"valtech\.co\.uk",
-        r"cgi\.com",
-        r"capita\.co\.uk",
         r"ucds\.email",
         r"naturalengland\.org\.uk",
     ]

tests/app/main/test_validators.py

@@ -79,8 +79,6 @@ def _gen_mock_field(x):
     'test@police.uk',
     'test@gov.police.uk',
     'test@GOV.PoliCe.uk',
-    'test@valtech.co.uk',
-    'test@cgi.com',
     'test@ucds.email',
     'test@naturalengland.org.uk',
 ])