Disable the test (1/n)

Disable the test because it is blocking pre-submit.

The analysis is at b/159569441#comment2. Waiting for the NetworkStack
team to figure out what's going wrong.

Bug: 159569441
Test: m
Change-Id: Ibb921b8e718c5c9cd86c5580010cb163125d8fae

tests/RollbackTest/NetworkStagedRollbackTest/src/com/android/tests/rollback/host/NetworkStagedRollbackTest.java

@@ -26,6 +26,7 @@ import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -72,6 +73,7 @@ public class NetworkStagedRollbackTest extends BaseHostJUnit4Test {
     /**
      * Tests failed network health check triggers watchdog staged rollbacks.
      */
+    @Ignore("b/159569441")
     @Test
     public void testNetworkFailedRollback() throws Exception {
         try {