remove mocks of oslo.service private members

We need to completely remove the mocks for oslo.service private members
in order to decouple nova from the requirements updates and be able to
update the constraint for oslo.service to a new version that has a
fixture for managing the sleep call being mocked (applied in the
following patch).

Change-Id: I0bbd2d7f9d6eb13d97587d867ef4d651809a7dd4
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

nova/tests/unit/compute/test_compute_mgr.py

@@ -6437,8 +6437,6 @@ class ComputeManagerBuildInstanceTestCase(test.NoDBTestCase):
                 self.context, mock.sentinel.instance,
                 requested_networks=requested_networks)
 
-    @mock.patch('oslo_service.loopingcall._ThreadingEvent.wait',
-                new=mock.Mock())
     @mock.patch('nova.compute.manager.ComputeManager._deallocate_network')
     @mock.patch('nova.compute.manager.LOG.warning')
     def test_try_deallocate_network_retry_direct(self, warning_mock,

nova/tests/unit/virt/disk/mount/test_api.py

@@ -28,8 +28,6 @@ AUTOMAP_PARTITION = "/dev/nullp77"
 MAP_PARTITION = "/dev/mapper/nullp77"
 
 
-# Make RetryDecorator not actually sleep on retries
-@mock.patch('oslo_service.loopingcall._ThreadingEvent.wait', new=mock.Mock())
 class MountTestCase(test.NoDBTestCase):
     def _test_map_dev(self, partition):
         mount = api.Mount(mock.sentinel.image, mock.sentinel.mount_dir)

nova/tests/unit/virt/libvirt/test_guest.py

@@ -34,8 +34,6 @@ if sys.version_info > (3,):
     long = int
 
 
-# Make RetryDecorator not actually sleep on retries
-@mock.patch('oslo_service.loopingcall._ThreadingEvent.wait', new=mock.Mock())
 class GuestTestCase(test.NoDBTestCase):
 
     def setUp(self):