Remove obsolete bluetooth pages

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
6 files changed