my.cnf: typo fix (bind-address) + migrate key_buffer (deprecated) to key_buffer_size

[doc75]

Fix a typo in the config file where we can find bind_adress instead of bind-address (cf. https://dev.mysql.com/doc/refman/5.5/en/server-options.html#option_mysqld_bind-address [Option-File Format])

It also change the key_buffer which is deprecated into key_buffer_size (warning issued during installation on Ubuntu 12.04 machine).

[igalic]

I think these should be two separate commits

[doc75]

OK, thanks for the advise, i just did the split of the 2 fixes into 2 commits.
Let me know if you think this still not done properly.

[igalic]

What will happen to existing installations' key_buffer directive?

[doc75]

They will be removed automatically by puppet.
Indeed the file is built with the template my.cnf.erb which is managed in server/config.pp.
In this file you can see that $mysql::server::options is assigned to $options variable, which is then used in the my.cnf.erb template. Therefore the template expansion will contain only the new key and any reference to the old one will be removed by puppet when applying this expanded template.