Set collation_connection on connection init

When I provisioned a mysql database on the mysql_node to use with my rails application I run into the following error: `ActiveRecord::StatementInvalid (Mysql2::Error: Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '=':`
I found out that the `collation_connection` was set to `utf8_general_ci`.
I was not able to change this connection at the rails side because I'm using the [cf-autoconfig](https://github.com/cloudfoundry/vcap-ruby/tree/master/auto-reconfiguration) gem.
And as a result the database.yml file is ignored.