Fix the marking of restricted network requests

Need to realized that the NOT_RESTRICTED bit is set by
default, so if looking at what bits are set to decide if
we want NOT_RESTRICTED cleared, we need to ignore the
bit itself.

bug:15456019

Change-Id: Iecae598f47ec7306d475e2262bb1c452ddf0fc75

core/java/android/net/ConnectivityManager.java

@@ -892,6 +892,7 @@ public class ConnectivityManager {
                 case NetworkCapabilities.NET_CAPABILITY_IMS:
                 case NetworkCapabilities.NET_CAPABILITY_RCS:
                 case NetworkCapabilities.NET_CAPABILITY_XCAP:
+                case NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED: //there by default
                     continue;
                 default:
                     // At least one capability usually provided by unrestricted