remove a spurious wait that could get us into trouble

it's not really clear that this wait is useful for anything
except generating bugs when we've done terible things to the
image during this test. Removing it as unneeded.

Change-Id: I88546bf3845d8e62d4baf5572f0403c0eaa983ba
Closes-Bug: #1229890
diff --git a/tempest/api/compute/images/test_images_oneserver_negative.py b/tempest/api/compute/images/test_images_oneserver_negative.py
index 6757e8a..52cc5ab 100644
--- a/tempest/api/compute/images/test_images_oneserver_negative.py
+++ b/tempest/api/compute/images/test_images_oneserver_negative.py
@@ -122,7 +122,6 @@
         alt_snapshot_name = data_utils.rand_name('test-snap-')
         self.assertRaises(exceptions.Conflict, self.client.create_image,
                           self.server_id, alt_snapshot_name)
-        self.client.wait_for_image_status(image_id, 'ACTIVE')
 
     @attr(type=['negative', 'gate'])
     def test_create_image_specify_name_over_256_chars(self):