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/ChooseLockGeneric.java

@@ -145,7 +145,8 @@ public class ChooseLockGeneric extends SettingsActivity {
             } else if (!mWaitingForConfirmation) {
                 ChooseLockSettingsHelper helper =
                         new ChooseLockSettingsHelper(this.getActivity(), this);
-                if (!helper.launchConfirmationActivity(CONFIRM_EXISTING_REQUEST, null, null)) {
+                if (!helper.launchConfirmationActivity(CONFIRM_EXISTING_REQUEST,
+                        getString(R.string.unlock_set_unlock_launch_picker_title))) {
                     mPasswordConfirmed = true; // no password set, so no need to confirm
                     updatePreferencesOrFinish();
                 } else {