brianmario/mysql2 — pull request #454 by yui-knk (2013-11-29 13:05:41+00:00)
Title: configuration.yml and my.cnf are written with sync mode

File open with non sync mode, sometimes spec task is executed before file tasks (`configuration.yml` and `my.cnf`) are complete. If spec task is executed before, DatabaseCredentials loading `spec/configuration.yml` to be false. So change with sync mode to ensure configuration.yml` and `my.cnf` are copyed completely.