[MS18] Augment data usage by default

Follow-up from ag/2815797, callers who uses the hidden API
will have their data augmented by default, and the public
API offers a way to opt-into augmentation.

However, since the data usage is going to the module.
All the hidden API usage must be eliminated. Also, from user
perspective, it is better for UI and API to have aligned
behavior.

Thus, enable augment data usage for public API callers.

Test: atest FrameworksNetTests \
      android.app.usage.cts.NetworkUsageStatsTest
Bug: 204830222
Change-Id: Ida254fac8d44c32d388f1886a866f7324a41ce75

framework-t/src/android/app/usage/NetworkStatsManager.java

@@ -139,6 +139,7 @@ public class NetworkStatsManager {
         mContext = context;
         mService = service;
         setPollOnOpen(true);
+        setAugmentWithSubscriptionPlan(true);
     }
 
     /** @hide */

service-t/src/com/android/server/net/NetworkStatsService.java

@@ -655,8 +655,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
 
     @Override
     public INetworkStatsSession openSession() {
-        // NOTE: if callers want to get non-augmented data, they should go
-        // through the public API
         return openSessionInternal(NetworkStatsManager.FLAG_AUGMENT_WITH_SUBSCRIPTION_PLAN, null);
     }
 
@@ -876,8 +874,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
     private long getNetworkTotalBytes(NetworkTemplate template, long start, long end) {
         assertSystemReady();
 
-        // NOTE: if callers want to get non-augmented data, they should go
-        // through the public API
         return internalGetSummaryForNetwork(template,
                 NetworkStatsManager.FLAG_AUGMENT_WITH_SUBSCRIPTION_PLAN, start, end,
                 NetworkStatsAccess.Level.DEVICE, Binder.getCallingUid()).getTotalBytes();