Fix remaining API tests under python3

This fixes the address_name method to return text, as the to_text
method from dnspython returns bytes, and make 3 new test modules pass.

Change-Id: I5d0e75bd9acdd517ed4a94b1959783a2437cf5a5

designate/network_api/base.py

@@ -108,4 +108,4 @@ class NetworkAPI(DriverPlugin):
         """
         Get the name for the address
         """
-        return reversename.from_address(address).to_text()
+        return reversename.from_address(address).to_text().decode('utf-8')

designate/tests/test_api/test_v2/test_zones.py

@@ -573,7 +573,7 @@ class ApiV2ZonesTest(ApiV2TestCase):
         # Check the headers are what we expect
         self.assertEqual(202, response.status_int)
         self.assertEqual('application/json', response.content_type)
-        self.assertEqual('""', response.body)
+        self.assertEqual(b'""', response.body)
 
     def test_invalid_xfr_request(self):
         # Create a zone

tests-py3.txt

@@ -1,7 +1,4 @@
 # Blacklist of tests failing on Python 3
-designate.tests.test_api.test_v2.test_floatingips
-designate.tests.test_api.test_v2.test_zones
-designate.tests.test_central.test_service
 designate.tests.test_pool_manager.test_service
 designate.tests.unit.test_central.test_basic
 designate.tests.unit.test_pool