Refcounting isn't available in Jython. Putting the jython test around it.

This closes patch "[ #490414 ] Jython and test_socket".

Lib/test/test_socket.py

@@ -90,12 +90,13 @@ if hasattr(socket, 'getservbyname'):
     except socket.error:
         pass
 
-try:
+import sys
+if not sys.platform.startswith('java'):
+    try:
         # On some versions, this loses a reference
-    import sys
         orig = sys.getrefcount(__name__)
         socket.getnameinfo(__name__,0)
-except SystemError:
+    except SystemError:
         if sys.getrefcount(__name__) <> orig:
             raise TestFailed,"socket.getnameinfo loses a reference"