Add config option for scep workflow type, cleanup code and fix docs.

The workflow triggered by scepc2 is now configurable through a config option.

Removes legacy debugging code and improves documentation.
Refactoring SCEP handler config, remove v2 suffix from service class

Add configuration options to the scep handler (see perldoc of handler
script for details)
Remove the v2 Suffix from the SCEP Service class.