fix eof and unused imports in test_nbd_entries.py

Author: abh1sar

scripts/vm/hypervisor/kvm/imageserver/tests/test_nbd_entries.py

@@ -24,9 +24,7 @@
 import subprocess
 import tempfile
 import unittest
-from unittest import mock
 
-from imageserver.backends import nbd as nbd_backend
 from imageserver.backends.nbd import NbdConnection, _entries_to_pairs
 from imageserver.util import is_fallback_dirty_response
 
@@ -193,4 +191,4 @@ def test_dirty_extents_match_writes(self):
 
 
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()