Enforce Keyguard policy in Notification Settings

- Applied getKeyguardDisabledFeatures for notification settings and
    notification setup page (after settings a screenlock)
- If a notification settings is disabled, the next least secure setting
    will be chosen
- Although KEYGUARD_DISABLE_UNREDACTED_NOTIFICATIONS can be set be
    profile, it will not be reflected in both settings page. This is
    because it does not affect the owner (user 0), as mentioned in
    DevicePolicyManagerService.PROFILE_KEYGUARD_FEATURES_AFFECT_OWNER
- Skip RedactionInterstitial if there is <= 1 options for the user
- Tested with both Setup wizard and settings case, both pattern and
    password, as well as toggling the policy on and off

Bug: 19307118
Bug: 17099898

Change-Id: If640d5576caa0163e9942569f7b4643a30bbfe0a

src/com/android/settings/ChooseLockPassword.java

@@ -559,7 +559,10 @@ public class ChooseLockPassword extends SettingsActivity {
             getActivity().finish();
             mDone = true;
             if (!wasSecureBefore) {
-                startActivity(getRedactionInterstitialIntent(getActivity()));
+                Intent intent = getRedactionInterstitialIntent(getActivity());
+                if (intent != null) {
+                    startActivity(intent);
+                }
             }
         }