Update confirm device credentials to spec, add fingerprint

- New strings in the screen.
- New layout/style.
- Clean up internal API's around it.
- Add fingerprint support if launched from externally
- Separate theme if launched from externally
- If launched from above Keyguard, use SHOW_WHEN_LOCKED flag

Change-Id: Icdf9bf9e0506841f24e8aab5f0f1d1f4b688951f

src/com/android/settings/ChooseLockPassword.java

@@ -243,7 +243,7 @@ public class ChooseLockPassword extends SettingsActivity {
                 updateStage(Stage.Introduction);
                 if (confirmCredentials) {
                     mChooseLockSettingsHelper.launchConfirmationActivity(CONFIRM_EXISTING_REQUEST,
-                            null, null);
+                            getString(R.string.unlock_set_unlock_launch_picker_title));
                 }
             } else {
                 mFirstPin = savedInstanceState.getString(KEY_FIRST_PIN);