Revert "Skip connectivity unit tests before S"

This reverts commit 05dd1ba540.

Reason for revert: Skips more tests than it should in AOSP
Bug: 192302892

Change-Id: I7c5638d8c1cc626354d240a06af758e1cdd92e94

tests/unit/java/android/net/VpnManagerTest.java

@@ -27,11 +27,9 @@ import static org.mockito.Mockito.when;
 
 import android.content.ComponentName;
 import android.content.Intent;
-import android.os.Build;
 import android.test.mock.MockContext;
 import android.util.SparseArray;
 
-import androidx.test.filters.SdkSuppress;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -45,7 +43,6 @@ import org.junit.runner.RunWith;
 /** Unit tests for {@link VpnManager}. */
 @SmallTest
 @RunWith(AndroidJUnit4.class)
-@SdkSuppress(minSdkVersion = Build.VERSION_CODES.S, codeName = "S")
 public class VpnManagerTest {
     private static final String PKG_NAME = "fooPackage";