CDK key loading modified for better database compatibility

Users were unable to log on to the system and received the error "There has been an issue; please consult your system administrator." Investigation showed the log errors stating "(dataencryption.DataKeyProvider) ERROR localhost - Could not get CDK from systemKeyManagementCache - System CDK is null". This was an issue specific to the MS SQL Server database when there were 6 or more CDKs in the database: CDK keys are loaded from database into Cache using an SQL statement which had the ORDER clause. By default, the ORDER clause treats NULL values differently on different databases, and this caused MS SQL databases to not load a necessary CDK key. To resolve this, the SQL query has been modified so the result will be the same for all supported daatbases (Oracle, Postgres & MS SQL Server).