fix(controller): allow xip.io domains

xip.io is a magic domain name that provides wildcard DNS for any IP
IP address. In some cases when testing, DEIS_TEST_DOMAIN is set to
an IP address of one of the nodes.

Author: Matthew Fisher

controller/api/serializers.py

@@ -245,6 +245,8 @@ def validate_domain(self, value):
         if value[-1:] == ".":
             value = value[:-1]  # strip exactly one dot from the right, if present
         labels = value.split('.')
+        if 'xip.io' in value:
+            return value
         if labels[0] == '*':
             raise serializers.ValidationError(
                 'Adding a wildcard subdomain is currently not supported.')

controller/api/tests/test_domain.py

@@ -58,6 +58,7 @@ def test_manage_domain(self):
             '3com.com',
             'w3.example.com',
             'MYDOMAIN.NET',
+            'autotest.127.0.0.1.xip.io',
         ]
         for domain in test_domains:
             body = {'domain': domain}