DPM config: remove usage of DPM_DAV_ENABLED variable
(duplicates HTTPS_ENABLED)
DPM config: remove confusing usage of DPM_HOST variable
- Duplicates DPM_HOSTS and DPM_IS_HEAD_NODE
- Replaced by DEFAULT_DPM_HOST in UI/WN configuration
Merge pull request #71 from jouvin/umd3-dpm

DPM config: remove usage of DPM_DAV_ENABLED and DPM_HOST variables