Enforce structural NetworkAgent constraints am: 78c9a381c9

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

Change-Id: I464f29b20303849c0fec709a29778457383d7f57
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>