image/ubuntu: prevent services from being started in a staging chroot
image/ubuntu: prevent services from being started in a staging chroot

Related-bug: #1401764
blueprint support-ubuntu-trusty
Change-Id: Ie22009923acd7a84ecf2435a0294560e47dce3cc

dancn/fuel-main-dev,teselkin/fuel-main,ddepaoli3/fuel-main-dev,eayunstack/fuel-main,huntxu/fuel-main,ddepaoli3/fuel-main-dev,huntxu/fuel-main,AnselZhangGit/fuel-main,SergK/fuel-main,SergK/fuel-main,zhaochao/fuel-main,teselkin/fuel-main,SmartInfrastructures/fuel-main-dev,SergK/fuel-main,SmartInfrastructures/fuel-main-dev,ddepaoli3/fuel-main-dev,teselkin/fuel-main,zhaochao/fuel-main,teselkin/fuel-main,Fiware/ops.Fuel-main-dev,stackforge/fuel-main,huntxu/fuel-main,Fiware/ops.Fuel-main-dev,AnselZhangGit/fuel-main,dancn/fuel-main-dev,zhaochao/fuel-main,stackforge/fuel-main,Fiware/ops.Fuel-main-dev,ddepaoli3/fuel-main-dev,stackforge/fuel-main,zhaochao/fuel-main,eayunstack/fuel-main,Fiware/ops.Fuel-main-dev,SmartInfrastructures/fuel-main-dev,eayunstack/fuel-main,AnselZhangGit/fuel-main,zhaochao/fuel-main,dancn/fuel-main-dev,SmartInfrastructures/fuel-main-dev,AnselZhangGit/fuel-main,dancn/fuel-main-dev