Close sockets from ConnectivityService#setFirewallChainEnabled am: b73b5e5183

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

Change-Id: Ib29d2174c03d822f788de06a25ac9e4103d0bc08
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>