Start using NetworkUtils.numericToInetAddress.

Generates InetAddresses without risking an accidental dns lookup.  For use with supposedly
numeric-only ip address strings.

Change-Id: I694f3976ce1c6382854706f6557ea88a289add3a
diff --git a/services/java/com/android/server/ConnectivityService.java b/services/java/com/android/server/ConnectivityService.java
index 8e39a63..b49f216 100644
--- a/services/java/com/android/server/ConnectivityService.java
+++ b/services/java/com/android/server/ConnectivityService.java
@@ -286,8 +286,8 @@
                     com.android.internal.R.string.config_default_dns_server);
         }
         try {
-            mDefaultDns = InetAddress.getByName(dns);
-        } catch (UnknownHostException e) {
+            mDefaultDns = NetworkUtils.numericToInetAddress(dns);
+        } catch (IllegalArgumentException e) {
             loge("Error setting defaultDns using " + dns);
         }