Add test to verify registration/unregistration mdns event listener am: 5b769a07ae

Original change: https://android-review.googlesource.com/c/platform/system/netd/+/2114883

Change-Id: I52da69e29b2e9214feb851e3d3e391ab610f7430
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: 28a0bf9a67d8bfc5b95c3f0ce5db34a618df98ec
  1. client/
  2. include/
  3. netutils_wrappers/
  4. server/
  5. tests/
  6. .editorconfig
  7. Android.bp
  8. NOTICE
  9. OWNERS
  10. PREUPLOAD.cfg
  11. TEST_MAPPING