Switch /etc/my.cnf to /etc/mysql/my.cnf on 14.04

On Ubuntu 14.04 MySQL no longer looks for /etc/my.cnf before /etc/mysql/my.cnf, this was causing MySQL to be launched with the wrong configuration file. Moved bind address configuration into /etc/mysql/conf.d/bind-inaddr-any.cnf and remaining replication related configuration to /etc/mysql/conf.d/replication.cnf and eliminated /etc/my.cnf on 14.04 hosts.

Leaving /etc/my.cnf on 12.04 hosts to reduce change on existing hosts.