Check if nailgun's requirements do not conflict
Check if nailgun's requirements do not conflict

Added simple test that will try to parse nailgun's
requirements and see if there are any problems with them.

Change-Id: I342eda0a3b019780e0d452455734591aab91f6e9
Closes-Bug: #1462281

prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,nebril/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,prmtl/fuel-web,nebril/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,SmartInfrastructures/fuel-web-dev,huntxu/fuel-web,prmtl/fuel-web,nebril/fuel-web,eayunstack/fuel-web,stackforge/fuel-web,huntxu/fuel-web,stackforge/fuel-web,huntxu/fuel-web