Enforce structural NetworkAgent constraints am: 78c9a381c9 am: c1581b5567

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

Change-Id: I515f9c6c10913c21ee9509924074e74847e0b614
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>