Ignore all tests in IpSecManagerTunnelTest with instant apps

Test runner will crash while tring to get test network service
in IpSecManagerTunnelTest. Because MANAGE_TEST_NETWORKS
permission can't be granted to instant apps. So ignore all tests
in this file.

Bug: 133399750
Test: atest CtsNetTestCases --instant
Change-Id: I5a096f20ec168133dbb65d27d3388c01e6ee895b
diff --git a/tests/cts/net/src/android/net/cts/IpSecManagerTunnelTest.java b/tests/cts/net/src/android/net/cts/IpSecManagerTunnelTest.java
index 6e96682..55a0918 100644
--- a/tests/cts/net/src/android/net/cts/IpSecManagerTunnelTest.java
+++ b/tests/cts/net/src/android/net/cts/IpSecManagerTunnelTest.java
@@ -59,6 +59,7 @@
 import android.os.IBinder;
 import android.os.ParcelFileDescriptor;
 import android.os.SystemProperties;
+import android.platform.test.annotations.AppModeFull;
 
 import androidx.test.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
@@ -81,6 +82,7 @@
 import org.junit.runner.RunWith;
 
 @RunWith(AndroidJUnit4.class)
+@AppModeFull(reason = "MANAGE_TEST_NETWORKS permission can't be granted to instant apps")
 public class IpSecManagerTunnelTest extends IpSecBaseTest {
     private static final String TAG = IpSecManagerTunnelTest.class.getSimpleName();