Fixed dd_user and dd_group reference in datadog::integrations::nginx.
Merge pull request #31 from zylad/master

Fixed dd_user and dd_group reference in datadog::integrations::nginx.
Backports zylad log_level variable on master

Manually cherry-picked pull #32 work and only kept the changes
that concerned log_level. The other changes that concerned upgrading
puppet DSL or style have been merged to the branch soon to be released
as v1.0.0 and merged to master as such, leaving this obsolete code
for very old puppet installs