fixed bug in master - unregister slaves when they disconnect


client/mysqlmanagerc.c:
  changed default port
include/mysql.h:
  use my_net_*
libmysql/manager.c:
  use my_net_*
mysql-test/mysql-test-run.sh:
  added support for client strace
sql/sql_parse.cc:
  unregister slaves on disconnect
sql/sql_repl.cc:
  unregister slaves on disconnect
sql/sql_repl.h:
  unregister slaves on disconnect
tools/mysqlmanager.c:
  changed to use my_net_*