Remove deprecated remove-channel/removeChannel

Fixes: https://pagure.io/koji/issue/3356

tests/test_hub/test_remove_channel.py

@@ -1,38 +0,0 @@
-import unittest
-
-import mock
-
-import koji
-import kojihub
-
-UP = kojihub.UpdateProcessor
-
-
-class TestRemoveChannel(unittest.TestCase):
-    def getUpdate(self, *args, **kwargs):
-        update = UP(*args, **kwargs)
-        update.execute = mock.MagicMock()
-        self.updates.append(update)
-        return update
-
-    def setUp(self):
-        self.UpdateProcessor = mock.patch('kojihub.UpdateProcessor',
-                                          side_effect=self.getUpdate).start()
-        self.updates = []
-        self.context = mock.patch('kojihub.context').start()
-        self.context.session.assertPerm = mock.MagicMock()
-        self.exports = kojihub.RootExports()
-        self.channel_name = 'test-channel'
-
-    def tearDown(self):
-        mock.patch.stopall()
-
-    @mock.patch('kojihub.get_channel_id')
-    def test_non_exist_channel(self, get_channel_id):
-        get_channel_id.side_effect = koji.GenericError('No such channel: %s' % self.channel_name)
-
-        with self.assertRaises(koji.GenericError):
-            kojihub.remove_channel(self.channel_name)
-
-        get_channel_id.assert_called_once_with(self.channel_name, strict=True)
-        self.assertEqual(len(self.updates), 0)