Inform Application thread to block for network rules to be updated. am: 3bad67bf01 am: 11ca5138aa

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2062965

Change-Id: I4b5cf4f949dcf7ead902ba0f7968e5a34d454f14
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>