Update log level

This is a follow-up commit for aosp/2624381.

Test: TH
Change-Id: I4125fffe13e3c5cf61a86f685eb8ac87736d15e3
diff --git a/service/src/com/android/server/connectivity/Nat464Xlat.java b/service/src/com/android/server/connectivity/Nat464Xlat.java
index b315235..bbf9cef 100644
--- a/service/src/com/android/server/connectivity/Nat464Xlat.java
+++ b/service/src/com/android/server/connectivity/Nat464Xlat.java
@@ -567,7 +567,7 @@
         try {
             return (Inet6Address) Inet6Address.getByAddress(v6Addr);
         } catch (UnknownHostException e) {
-            Log.e(TAG, "getByAddress should never throw for a numeric address");
+            Log.wtf(TAG, "getByAddress should never throw for a numeric address", e);
             return null;
         }
     }