Fix test result affected by error message rewording.
errmsg.txt:
  Reword error messages.
set_var.cc:
  Reorder variables.
mysqld.cc:
  Reorder options.


sql/mysqld.cc:
  Reorder options.
sql/set_var.cc:
  Reorder variables.
sql/share/errmsg.txt:
  Reword error messages.
mysql-test/r/user_limits.result:
  Fix test result affected by error message rewording.