Do not purge yum-plugin-fastestmirror package
Do not purge yum-plugin-fastestmirror package

It will be helpful for speed up the package installation.

Closes-Bug: #1525514
Change-Id: Id40a0afa30dd0a142bee3b13f7622cb0d42d9298

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