Allow EXTRA_DEB_REPOS to multistrap general repos
Allow EXTRA_DEB_REPOS to multistrap general repos

In before it was only working if all the repositories in EXTRA_DEB_REPOS
were from the OSCI-VM repos.

Closes-Bug: 1381672
Change-Id: I25806855cad76e8f7b106a778bf1c80c85555a16

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