fix pep8 issues in api/v3.py
fix pep8 issues in api/v3.py

voxpupuli/pypuppetdb,amwilson/pypuppetdb,dforste/pypuppetdb,jorik041/pypuppetdb,puppet-community/pypuppetdb,vicinus/pypuppetdb,jcastillocano/pypuppetdb,jcastillocano/pypuppetdb