NSS needed it for getting VpnInfo[], NetworkState[] and
activeLinkProperties which it used to query via ConnectivityManager.
For VpnInfo[], this was racy as NSS may ignore intermediate changes to a
VPN's underlying networks. See http://b/123961098 for more context.
It may also lead to deadlocks b/w ConnectivityService and
NetworkStatsService. See http://b/126245192 for more info.
This change will ensure that NSS is never contending on any of
ConnectivityService locks.
Bug: 123961098
Bug: 126245192
Bug: 120145746
Test: atest FrameworksNetTests
Change-Id: I57e117bb4e9efe491b19d6b5a479f2d58d1c58e6
65d59a826f