Now, PermissionMonitor reigster observer to listen the change from all users, but "uids allowed on restricted networks" should affect to all users instead of per each user. Thus, move the setting from Settings.Secure to Settings.Global. Bug: 189705071 Test: atest FrameworksNetTests Ignore-AOSP-First: Need cherry-pick Change-Id: Ibea354d8dda1f02652a193820f3f9eb573b9a956