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.
Comment replication.cnf

Provide reason for apparently unrelated configuration items
Merge pull request #395 from blueboxgroup/fix-trusty-mysql

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