- The "mysql client in mysqld"(which is used by
   replication and federated) should use alarms instead of setting
   socket timeout value if the rest of the server uses alarm. By
   always calling 'my_net_set_write_timeout'
   or 'my_net_set_read_timeout' when changing the timeout value(s), the
   selection whether to use alarms or timeouts will be handled by
   ifdef's in those two functions. 
 - Move declaration of 'vio_timeout' into "vio_priv.h"