Remove unused imports

Author: Tabrizian

qa/L0_grpc/grpc_client_plugin_test.py

@@ -25,13 +25,11 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 import sys
-from functools import partial
 import json
 
 sys.path.append("../common")
 
 import unittest
-from unittest.mock import AsyncMock, patch, MagicMock
 import numpy as np
 import test_util as tu
 import tritonclient.grpc as tritongrpcclient