Only apply tcp buffer sizes for default net

This may mean that secondary networks have bad network settings,
but currently default settings are overriden by secondary nets
which seems worse.

bug:13211589
Change-Id: I08d56e618208781bf6b21a88663c2b8503a4f226

services/java/com/android/server/ConnectivityService.java

@@ -2305,9 +2305,9 @@ public class ConnectivityService extends IConnectivityManager.Stub {
             mInetConditionChangeInFlight = false;
             // Don't do this - if we never sign in stay, grey
             //reportNetworkCondition(mActiveDefaultNetwork, 100);
+            updateNetworkSettings(thisNet);
         }
         thisNet.setTeardownRequested(false);
-        updateNetworkSettings(thisNet);
         updateMtuSizeSettings(thisNet);
         handleConnectivityChange(newNetType, false);
         sendConnectedBroadcastDelayed(info, getConnectivityChangeDelay());
@@ -3034,7 +3034,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
                 case NetworkStateTracker.EVENT_NETWORK_SUBTYPE_CHANGED: {
                     info = (NetworkInfo) msg.obj;
                     int type = info.getType();
-                    updateNetworkSettings(mNetTrackers[type]);
+                    if (mNetConfigs[type].isDefault()) updateNetworkSettings(mNetTrackers[type]);
                     break;
                 }
             }