build.py fails with error on AUFS
build.py fails with error on AUFS

add workaround to avoid the issue to image-building document.

Change-Id: Icf34acb2f25c813dee7c7a3dfbb71560be5a970f
Closes-Bug: #1487458

rajalokan/kolla,openstack/kolla,dardelean/kolla-ansible,coolsvap/kolla,toby82/kolla,rahulunair/kolla,coolsvap/kolla,mandre/kolla,dardelean/kolla-ansible,openstack/kolla,negronjl/kolla,tonyli71/kolla,rajalokan/kolla,rajalokan/kolla,mrangana/kolla,stackforge/kolla,fdumpling/kolla,limamauricio/mykolla,intel-onp/kolla,stackforge/kolla,fdumpling/kolla,toby82/kolla,stackforge/kolla,negronjl/kolla,limamauricio/mykolla,GalenMa/kolla,rahulunair/kolla,toby82/kolla,nihilifer/kolla,mandre/kolla,coolsvap/kolla,fdumpling/kolla,mandre/kolla,dardelean/kolla-ansible,intel-onp/kolla,mrangana/kolla,negronjl/kolla,limamauricio/mykolla,nihilifer/kolla,tonyli71/kolla,GalenMa/kolla