Replaced database_user with mysql_user

database_user has been deprecated in favor of mysql_user.
Merge pull request #501 from ryansechrest/patch-1

Replaced database_user with mysql_user
fix spec tests, by adding osrelease facts
Merge pull request #502 from igalic/osrelease

fix spec tests, by adding osrelease facts
Backup user needs PROCESS privilege when doing file-per-database backups

The following error occured:
mysqldump: Couldn't execute 'SELECT /*!40001 SQL_NO_CACHE */ * FROM `INNODB_BUFFER_PAGE`': Access denied; you need (at least one of) the PROCESS privilege(s) for this operation (1227)
Merge pull request #500 from nerdlich/patch-1

User needs PROCESS privilege when doing file-per-database backup