Fix conditional mixup in dtagcloud models which resulted in invalid preseeds

This fixes issues with creating user and setting the razor specific hostnames, which is unwanted.
Revert "config.set_name does not get evaluted correctly"

This reverts commit 19f188ce4a6089c23dd4b5478c974b3492a9e03c.
The yaml config is configured as string not as boolean

so we have to do an string compare for now.
Later we should investigate how to handle a boolean taken from yaml config
and handled in a ruby erb template.