Test VPN app exclusion

Initialize the VpnManagerServiceTest and verify app exclusion
design.

Bug: 231373589
Test: atest FrameworksNetTests
Change-Id: Icf3994a58de7b2fcc6fafe9712b5ac94e6c2c134
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index 3ea27f7..a05ca92 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -63,6 +63,7 @@
         "java/com/android/internal/net/NetworkUtilsInternalTest.java",
         "java/com/android/internal/net/VpnProfileTest.java",
         "java/com/android/server/NetworkManagementServiceTest.java",
+        "java/com/android/server/VpnManagerServiceTest.java",
         "java/com/android/server/connectivity/IpConnectivityEventBuilderTest.java",
         "java/com/android/server/connectivity/IpConnectivityMetricsTest.java",
         "java/com/android/server/connectivity/MultipathPolicyTrackerTest.java",