Revert "Ignore new test until prebuilts are updated."

This reverts commit e14433a80e17bed4ddc6149f49fc0a67d1c99cdf.

Reason for revert: Prebuilts are updated and test should pass
Merged-In: I60d5540821abcced03356f366775f16ee369d7f9

Change-Id: I5101bf71b3290933fc1ecf83a00b7d2080955242
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index b90eeac..fd6c165 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -199,7 +199,6 @@
 
 import org.junit.After;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -3415,7 +3414,6 @@
         }, NETWORK_SETTINGS);
     }
 
-    @Ignore("TODO: temporarily ignore tests until prebuilts are updated")
     @Test @IgnoreUpTo(SC_V2)
     public void testFirewallBlocking() {
         // Following tests affect the actual state of networking on the device after the test.