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/SetupChooseLockPattern.java

@@ -103,7 +103,9 @@ public class SetupChooseLockPattern extends ChooseLockPattern {
         @Override
         protected Intent getRedactionInterstitialIntent(Context context) {
             Intent intent = SetupRedactionInterstitial.createStartIntent(context);
-            SetupWizardUtils.copySetupExtras(getActivity().getIntent(), intent);
+            if (intent != null) {
+                SetupWizardUtils.copySetupExtras(getActivity().getIntent(), intent);
+            }
             return intent;
         }