Hide potentially invisible DO Disclosures by default

Hiding/unhiding a pref triggers an animation. DO Disclosures that may
not be visible should be hidden by default so that they fade in if
applicable, not fade out if not applicable.

Also, the network and security logging disclosures should only be shown
if logging is currently on or was on in the past and a network log was
retrieved at least once.

Bug: 32692748
Test: m RunSettingsRoboTests

Change-Id: I8c85f2f66ba295f145e5f5e79febb1b1a9bc6ede

src/com/android/settings/enterprise/SecurityLogsPreferenceController.java

@@ -30,6 +30,12 @@ public class SecurityLogsPreferenceController extends AdminActionPreferenceContr
         return mFeatureProvider.getLastSecurityLogRetrievalTime();
     }
 
+    @Override
+    public boolean isAvailable() {
+        return mFeatureProvider.isSecurityLoggingEnabled() ||
+                mFeatureProvider.getLastSecurityLogRetrievalTime() != null;
+    }
+
     @Override
     public String getPreferenceKey() {
         return KEY_SECURITY_LOGS;