Currently, even if apps don't have INTERNET permission and can not use
network, network access is considered not blocked and
ConnectivityService send onBlockedStatusChanged callback with
blocked=false.
This CL introduced BLOCKED_REASON_NETWORK_RESTRICTED and consider
network access from apps targetting W+ on V+ releases is blocked if apps
don't have INTERNET permission.
Permission is set when the user is added or package is installed and
permission is removed when the user is removed or packages is
uninstalled.
So ConnectivityService does not need to monitor permission change to
send onBlockedStatusChanged callback by permission change.
Test: CSBlockedReasonsTest
Bug: 339559837
Change-Id: I58d2a4eddc714e205f5b96219f95b637f2826c58
ee96ba0e60