On sparc, semisync master/slave status is always showed as OFF, this
is fixed by change rpl_semisync_master/slave_status variables from
long to char.

plugin/semisync/semisync_master.cc:
  Change rpl_semisync_master_status variables from long to char
plugin/semisync/semisync_master.h:
  Change rpl_semisync_master_status variables from long to char
plugin/semisync/semisync_slave.cc:
  Change rpl_semisync_slave_status variables from long to char
plugin/semisync/semisync_slave.h:
  Change rpl_semisync_slave_status variables from long to char