Enforce structural NetworkAgent constraints am: 78c9a381c9 am: 772b0f1e54

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2805415

Change-Id: Idac96beaf62c817827db4875827a739a70814c86
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>