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
Merged-In: I24fb5cd03cf30044edb7201426e11e0a818f0a7f