Remove duplicated OS volume from openstack.yaml
Remove duplicated OS volume from openstack.yaml

Closes-bug: #1411356
Change-Id: I98c19ceb98a957e219601cfe203a326698d44579

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