Introduce Settings.Global.WIFI_DEVICE_OWNER_CONFIGS_LOCKDOWN

This setting controls whether WiFi configurations created by a Device Owner app
should be locked down (that is, editable or removable only by the Device Owner).

Bug: 21427528
Change-Id: I0f8fb72bf9da1597e08d3dfc631d37b6b4178ff5
5 files changed