regress: add DEDUP_CONFIG_FMT variable to select old or new config format

regress: add DEDUP_CONFIG_FMT variable to select old or new config format

- define DEDUP_CONFIG_FMT in your "config" file or better on the command
  line like REGRESS_DEBUG
- values can be 1 or 2
  - 1 the dedupengine is defined in the Storage resource
  - 2 the dedupengine is defined in a separate resource and the
    dedupengine directive is added to all devices
    (like the Device Type = Dedup)