Add validation script for broken symlinks
Add validation script for broken symlinks

Change-Id: Iae6d9f26e1a8dd7d565e9dbd815816c26cb92b74
Partially-implements: blueprint add-broken-symlink-check

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