Encourage user to specify a name for the binlog index file (either by giving an argument to --log-bin,
or by using --log-bin-index). This is so that he does not have a replication break when his master's
hostname changes. Plus binary logging options consistency checks.


sql/mysqld.cc:
  * Encourage user to specify a name for the binlog index file (either by giving an argument to --log-bin,
  or by using --log-bin-index). This is so that he does not have a replication break when his master's
  hostname changes. Why not a fatal error? To not break existing many-machine setups.
  * --log-bin-index without --log-bin does not make sense.
  * --log-slave-updates without --log-bin does not either.
support-files/my-huge.cnf.sh:
  encourage providing an argument to log-bin
support-files/my-innodb-heavy-4G.cnf.sh:
  encourage providing an argument to log-bin
support-files/my-large.cnf.sh:
  encourage providing an argument to log-bin
support-files/my-medium.cnf.sh:
  encourage providing an argument to log-bin
support-files/my-small.cnf.sh:
  encourage providing an argument to log-bin