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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