Add source base container link for centos
Add source base container link for centos

This is needed to start adding source containers such as the upcoming
keystone patch.

Change-Id: I82add1c16094b331afa5b0c2a58f21ea29cd647d
Partially-Implements: blueprint install-from-source

rajalokan/kolla,tonyli71/kolla,HackToday/kolla,GalenMa/kolla,nihilifer/kolla,toby82/kolla,mandre/kolla,stackforge/kolla,coolsvap/kolla,invenfantasy/kolla,fdumpling/kolla,LoHChina/kolla,toby82/kolla,nihilifer/kolla,mrangana/kolla,coolsvap/kolla,negronjl/kolla,openstack/kolla,invenfantasy/kolla,intel-onp/kolla,openstack/kolla,mandre/kolla,rahulunair/kolla,jakedahn/kolla,jakedahn/kolla,meticulo3366/kolla,LoHChina/kolla,chenzhiwei/kolla,tonyli71/kolla,GalenMa/kolla,rajalokan/kolla,intel-onp/kolla,brk3/kolla,stackforge/kolla,chenzhiwei/kolla,brk3/kolla,negronjl/kolla,toby82/kolla,invenfantasy/kolla,fdumpling/kolla,chenzhiwei/kolla,rahulunair/kolla,LoHChina/kolla,mandre/kolla,rajalokan/kolla,meticulo3366/kolla,dardelean/kolla-ansible,limamauricio/mykolla,HackToday/kolla,fdumpling/kolla,limamauricio/mykolla,negronjl/kolla,limamauricio/mykolla,stackforge/kolla,coolsvap/kolla,dardelean/kolla-ansible,dardelean/kolla-ansible,HackToday/kolla,mrangana/kolla,jakedahn/kolla