Fix for mock API change, bump setup.cfg version to 2015.2

Also, fix a unit test that is failing with newer versions of mock,
which apparently changed the API around assert_has_calls()

Change-Id: Icf7f159fb37783a38a33759963f04f50ec05e262
Depends-on: Ide474eb90acf0d07a807c401173b1f14f351f1c9

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = akanda-appliance
-version = 2015.1
+version = 2015.2
 summary = Akanda Linux-based L3 software router
 description-file =
     README.md

test/unit/drivers/test_hostname.py

@@ -46,16 +46,13 @@ class HostnameTestCase(TestCase):
         ])
 
     def test_update_hosts(self):
-        expected = [
+        expected = mock.call('/tmp/hosts', '\n'.join([
             '127.0.0.1  localhost',
             '::1  localhost ip6-localhost ip6-loopback',
             'fdca:3ba5:a17a:acda:f816:3eff:fe66:33b6  akanda'
-        ]
+        ]))
         self.mgr.update_hosts(CONFIG)
         self.mock_execute.assert_has_calls([
             mock.call(['mv', '/tmp/hosts', '/etc/hosts'], 'sudo')
         ])
-        self.mock_replace_file.assert_has_calls(mock.call(
-            '/tmp/hosts',
-            '\n'.join(expected))
-        )
+        self.mock_replace_file.assert_has_calls([expected])