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/ChooseLockPattern.java

@@ -379,7 +379,8 @@ public class ChooseLockPattern extends SettingsActivity {
                     updateStage(Stage.NeedToConfirm);
                     boolean launchedConfirmationActivity =
                         mChooseLockSettingsHelper.launchConfirmationActivity(
-                                CONFIRM_EXISTING_REQUEST, null, null);
+                                CONFIRM_EXISTING_REQUEST,
+                                getString(R.string.unlock_set_unlock_launch_picker_title));
                     if (!launchedConfirmationActivity) {
                         updateStage(Stage.Introduction);
                     }