Environment should only warn when asked.

Instead of warning on Process.SYSTEM_UID, which is also used by the
Settings app, change to have the parent process explicitly ask for
warnings.

Bug: 8667286
Change-Id: Ib26676694a4041ff4e6d3ffdcc14055b7eba13c7

services/java/com/android/server/SystemServer.java

@@ -26,6 +26,7 @@ import android.content.pm.IPackageManager;
 import android.content.res.Configuration;
 import android.media.AudioService;
 import android.net.wifi.p2p.WifiP2pService;
+import android.os.Environment;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
@@ -1055,6 +1056,8 @@ public class SystemServer {
         // as efficient as possible with its memory usage.
         VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
 
+        Environment.setUserRequired(true);
+
         System.loadLibrary("android_servers");
         init1(args);
     }