Move DumpWriter to libnetdutils

resolver related component in libnetd_resolv
needs it to easily print dump log.

Bug: 122564854
Test: built, flashed, booted
      system/netd/tests/runtests.sh pass
      adb shell dumpsys netd, worked fine

Change-Id: Ic97d5f21b738fc3074e9308f4846191e744ed479
diff --git a/server/NetworkController.cpp b/server/NetworkController.cpp
index b3297bb..a77a547 100644
--- a/server/NetworkController.cpp
+++ b/server/NetworkController.cpp
@@ -36,16 +36,18 @@
 
 #include "Controllers.h"
 #include "DummyNetwork.h"
-#include "DumpWriter.h"
 #include "Fwmark.h"
 #include "LocalNetwork.h"
 #include "PhysicalNetwork.h"
 #include "RouteController.h"
 #include "VirtualNetwork.h"
+#include "netdutils/DumpWriter.h"
 #include "netid_client.h"
 
 #define DBG 0
 
+using android::netdutils::DumpWriter;
+
 namespace android {
 namespace net {