and convert it to a warning instead of direct manipulation with the
thread error stack.
Fix a bug in handler::print_erorr when a garbled message was
printed for HA_ERR_NO_SUCH_TABLE.
This is a pre-requisite patch for the fix for Bug#12713 Error in a stored
function called from a SELECT doesn't cause ROLLBACK of statem


sql/handler.cc:
  Use a standard mechanism to intercept the error message, instead
  of direct manipulation with thread error stack. 
  Fix a bug when for HA_ERR_NO_SUCH_TABLE handler::print_error() would
  print a garbled message.
sql/log.cc:
  Extend internal error handler interface to carry the message text.
sql/mysqld.cc:
  Extend internal error handler interface to carry the message text.
sql/sql_base.cc:
  Extend internal error handler interface to carry the message text.
sql/sql_class.cc:
  Extend internal error handler interface to carry the message text.
sql/sql_class.h:
  Extend internal error handler interface to carry the message text.
sql/sql_error.cc:
  Extend internal error handler interface to carry the message text.