Merge changes from topic "am-9a435ce648dc47d49fc32dc2680fa5b7" into qt-r1-dev-plus-aosp

* changes:
  Revert "Take all VPN underlying networks into account when migrating traffic for" am: ac06c1022d am: 3e9726c69c
  Revert "NetworkStatsService: Fix getDetailedUidStats to take VPNs into account." am: 055992b112 am: 9b8282b7ba
  Revert "Addressing comments for http://ag/7700679." am: 1fbf261c01 am: 25f881d116
  Revert "Add one more test for VPN usage stats." am: 54a08a686d am: 469ee82902