Add missing 'yum clean all' in oraclelinux base
Add missing 'yum clean all' in oraclelinux base

This one line halfs the size of oraclelinux images, from over 1GB to
just over 500MB, bringing them inline with centos.

TrivialFix

Change-Id: I9fd89aeeec56207791fc289db9880b43b17536f5

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