PR geerlingguy#38 cleanup - change order and update README.

Fixes geerlingguy#17: Allow configuration of mysql slow query log.

Merge pull request geerlingguy#30 from BlackMesh/rename-python-my-cnf

Renamed python-my.cnf.j2 to user-my.cnf.j2 - has nothing to do with python.

Fixes geerlingguy#22: Make MySQL root user password settings more rel…

…iable.

Don't set replication role to 'master' by default, saves binlogs.

Issue geerlingguy#9: Allow mysql_packages to be overridden.

Use correct MySQL socket file for Ubuntu.

Add new mysql_config_file variable so Ubuntu my.cnf file paths are co…

…rrect.

Only add replication config if replication is setup.

Remove mysql_state variable, since it doesn't work as expected.