kill zombie COM_BINLOG_DUMP with the same server id on connect


sql/mysql_priv.h:
  made kill_one_thread global scope
sql/slave.cc:
  skip updates with the same server id as self
  fixed compiler warning
sql/sql_parse.cc:
  COM_BINLOG_DUMP is followed by a simulation of COM_QUIT for proper thread clean up
sql/sql_repl.cc:
  kill zombie COM_BINLOG_DUMP with the same server id on connect,
  more verbose binlog_send process status