Changing the default of libmysqlclient : it's now NO reconnection.

All our programs which use mysql_real_connect() and mysql_connect() are updated accordingly, though I have deliberately
made mysqlimport not reconnect anymore (already true for mysqldump >= 4.1.8).
All Connector devs have been warned about the change I'm doing here - which was agreed with Monty,
and fixes BUG#2555.

client/mysqlshow.c

@@ -125,6 +125,7 @@ int main(int argc, char **argv)
     fprintf(stderr,"%s: %s\n",my_progname,mysql_error(&mysql));
     exit(1);
   }
+  mysql.reconnect= 1;
 
   switch (argc)
   {