Send broadcast when changing restrict background.

When changing global restrict background status, send connectivity
change broadcast, since it radically changes DISCONNECTED/BLOCKED
status system-wide.

Also reduce verbose stats logging.

Bug: 5854466
Change-Id: I3b612c520f50cc3000a3a569b7e0ab5f691cc2bd
diff --git a/services/java/com/android/server/net/NetworkStatsRecorder.java b/services/java/com/android/server/net/NetworkStatsRecorder.java
index e7ba358..240cc1c 100644
--- a/services/java/com/android/server/net/NetworkStatsRecorder.java
+++ b/services/java/com/android/server/net/NetworkStatsRecorder.java
@@ -51,6 +51,7 @@
 public class NetworkStatsRecorder {
     private static final String TAG = "NetworkStatsRecorder";
     private static final boolean LOGD = true;
+    private static final boolean LOGV = false;
 
     private final FileRotator mRotator;
     private final NonMonotonicObserver<String> mObserver;
@@ -170,7 +171,7 @@
 
         mLastSnapshot = snapshot;
 
-        if (LOGD && unknownIfaces.size() > 0) {
+        if (LOGV && unknownIfaces.size() > 0) {
             Slog.w(TAG, "unknown interfaces " + unknownIfaces + ", ignoring those stats");
         }
     }