Test whether APF program actually runs

Adds a test that sends a ping packet, asserts its reply, then installs a
filter and asserts that the second ping packet is dropped.

Test: test only
Change-Id: I832ea1b3cc35a44c98fbf8c86c16bf753f183c92
diff --git a/tests/cts/net/Android.bp b/tests/cts/net/Android.bp
index 074c587..768ba12 100644
--- a/tests/cts/net/Android.bp
+++ b/tests/cts/net/Android.bp
@@ -46,6 +46,7 @@
     ],
     jarjar_rules: "jarjar-rules-shared.txt",
     static_libs: [
+        "ApfGeneratorLib",
         "bouncycastle-unbundled",
         "FrameworksNetCommonTests",
         "core-tests-support",