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/XfrmController.cpp b/server/XfrmController.cpp
index de9aa0b..b7f6649 100644
--- a/server/XfrmController.cpp
+++ b/server/XfrmController.cpp
@@ -54,7 +54,6 @@
 #include <log/log.h>
 #include <log/log_properties.h>
 #include <logwrap/logwrap.h>
-#include "DumpWriter.h"
 #include "Fwmark.h"
 #include "InterfaceController.h"
 #include "NetdConstants.h"
@@ -65,12 +64,15 @@
 #include "android-base/stringprintf.h"
 #include "android-base/strings.h"
 #include "android-base/unique_fd.h"
+#include "netdutils/DumpWriter.h"
 #include "netdutils/Fd.h"
 #include "netdutils/Slice.h"
 #include "netdutils/Syscalls.h"
 
 using android::net::INetd;
+using android::netdutils::DumpWriter;
 using android::netdutils::Fd;
+using android::netdutils::ScopedIndent;
 using android::netdutils::Slice;
 using android::netdutils::Status;
 using android::netdutils::StatusOr;