Add IPaddressUtil

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/SocketModuleBuiltins.java

@@ -84,6 +84,7 @@
 import com.oracle.graal.python.runtime.exception.PException;
 import com.oracle.graal.python.runtime.exception.PythonErrorType;
 import com.oracle.graal.python.runtime.sequence.storage.SequenceStorage;
+import com.oracle.graal.python.util.IPAddressUtil;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.TruffleFile;
 import com.oracle.truffle.api.TruffleLanguage;
@@ -96,8 +97,6 @@
 import com.oracle.truffle.api.frame.VirtualFrame;
 import com.oracle.truffle.api.profiles.BranchProfile;
 
-import sun.net.util.IPAddressUtil;
-
 @CoreFunctions(defineModule = "_socket")
 public class SocketModuleBuiltins extends PythonBuiltins {
     // address families