Close sockets from ConnectivityService#setFirewallChainEnabled am: b73b5e5183 am: 969778916b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/net/+/23207736

Change-Id: If71908ae524a0c34182539b42e95cc0090133e0a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>