Only log exceptions if the IpReachabilityMonitor is still running.

It's not terribly interesting to see logged exceptions about reads
on sockets that were deliberately closed due to normal tear down.

Change-Id: Ib6834a98b6f086fc40ce19db60c161414459d758

services/net/java/android/net/ip/IpReachabilityMonitor.java

@@ -423,7 +423,7 @@ public class IpReachabilityMonitor {
                 try {
                     byteBuffer = recvKernelReply();
                 } catch (ErrnoException e) {
-                    Log.w(TAG, "ErrnoException: ", e);
+                    if (stillRunning()) { Log.w(TAG, "ErrnoException: ", e); }
                     break;
                 }
                 final long whenMs = SystemClock.elapsedRealtime();