test: Remove unused mock

This just spews out lots of warnings, and the mock interface is never
used. This makes it harder to analyze with test failures.

Change-Id: I5c71da0806012dd5945f2f7ca19eb27b538c9571
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/test_network_manager.cpp b/test/test_network_manager.cpp
index f1cfa64..ff0840e 100644
--- a/test/test_network_manager.cpp
+++ b/test/test_network_manager.cpp
@@ -8,7 +8,7 @@
 
 #include <exception>
 #include <experimental/filesystem>
-#include <sdbusplus/test/sdbus_mock.hpp>
+#include <sdbusplus/bus.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
 
 #include <gtest/gtest.h>
@@ -26,12 +26,11 @@
 class TestNetworkManager : public testing::Test
 {
   public:
-    sdbusplus::SdBusMock sdbus_mock;
     sdbusplus::bus::bus bus;
     Manager manager;
     std::string confDir;
     TestNetworkManager() :
-        bus(sdbusplus::get_mocked_new(&sdbus_mock)),
+        bus(sdbusplus::bus::new_default()),
         manager(bus, "/xyz/openbmc_test/abc", "/tmp")
     {
         setConfDir();