1. Remove BluetoothSettingsObsolete 2. Remove DeviceListPreferenceObsoleteFragment 3. Update master swtich, now constantly point to new page 4. Update the tests Future cl will remove the page switch API in BluetoothFeatureProvider Bug: 63444548 Test: Test still pass Change-Id: I24fb5cd03cf30044edb7201426e11e0a818f0a7f