Do not allow to create 5.0.x-based environments
Do not allow to create 5.0.x-based environments

 - blacklisting 5.0.x releases

Closes-bug: 1368100

Change-Id: Ibf7898699203667e73d25b85ed20fe7d18081e21

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