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
Merged-In: I24fb5cd03cf30044edb7201426e11e0a818f0a7f