Fix valgrind errors with network timeouts.

sql/net_serv.cc

@@ -138,8 +138,6 @@ my_bool my_net_init(NET *net, Vio* vio)
   net->net_skip_rest_factor= 0;
   net->last_errno=0;
   net->unused= 0;
-  net->read_timeout=0;
-  net->write_timeout=0;
 
   if (vio != 0)					/* If real connection */
   {

sql/sql_client.cc

@@ -29,7 +29,7 @@ void my_net_local_init(NET *net)
 {
 #ifndef EMBEDDED_LIBRARY
   net->max_packet=   (uint) global_system_variables.net_buffer_length;
-
+  net->read_timeout= net->write_timeout= 0;
   my_net_set_read_timeout(net, (uint)global_system_variables.net_read_timeout);
   my_net_set_write_timeout(net,
                            (uint)global_system_variables.net_write_timeout);