test: Clear out old mocks prior to testing

This ensures we don't have stale mock data left over after each run
that will leak into unrelated tests.

Change-Id: I08bc12f99f1103c5d3024bf90047105b221622a2
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 f4de35a..2837296 100644
--- a/test/test_network_manager.cpp
+++ b/test/test_network_manager.cpp
@@ -70,6 +70,8 @@
     bool caughtException = false;
     try
     {
+        mock_clear();
+
         // Adds the following ip in the getifaddrs list.
         mock_addIF("igb1", 2);
         mock_addIP("igb1", "192.0.2.3", "255.255.255.128",
@@ -93,6 +95,8 @@
 {
     try
     {
+        mock_clear();
+
         mock_addIF("igb0", 1);
         mock_addIP("igb0", "192.0.2.2", "255.255.255.128",
                    IFF_UP | IFF_RUNNING);