Make socket.getservbyname test optional on socket module having that

attribute.  Jython does not have this function.

Closes SF patch #403667.

Lib/test/test_socket.py

@@ -83,6 +83,7 @@ for name in all_host_names:
 else:
     print 'FQDN not found'
 
+if hasattr(socket, 'getservbyname'):
     print socket.getservbyname('telnet', 'tcp')
     try:
         socket.getservbyname('telnet', 'udp')