Change the method name to align with master, reduce diverge issue (#1703

)

What I did
Change the method name to align with master, reduce diverge issue

sonic-utilities-tests/conftest.py

@@ -36,7 +36,7 @@ def setup_single_bgp_instance(request):
         bgp_mocked_json = os.path.join(
             test_path, 'mock_tables', 'dummy.json')
 
-    def mock_show_bgp_command(vtysh_cmd, bgp_namespace, vtysh_shell_cmd=constants.RVTYSH_COMMAND):
+    def mock_show_bgp_summary(vtysh_cmd, bgp_namespace, vtysh_shell_cmd=constants.RVTYSH_COMMAND):
         if os.path.isfile(bgp_mocked_json):
             with open(bgp_mocked_json) as json_data:
                 mock_frr_data = json_data.read()
@@ -74,7 +74,7 @@ def mock_run_show_ip_route_commands(request):
             return_value=mock_show_bgp_network_single_asic(request))
     else:
         bgp_util.run_bgp_command = mock.MagicMock(
-            return_value=mock_show_bgp_command("", ""))
+            return_value=mock_show_bgp_summary("", ""))
 
 
 @pytest.fixture