The shipped systemd-unit contains default values that could give the users a hard time starting the service. This warning should make things more clear.
* Add argument for database type
The optional argument "-d" allows to customize the database type.
* Modify patch to work with all db types
* Add database type to filename
* Add dynamic modification of systemd-unit
Dynamically changes the systemd-unit to require the appropriate database service.
Masgalor