Add sudo for RHEL builds
Add sudo for RHEL builds

RHEL does not include sudo in the default container image, while other
RPM based distros do.  As a result, some services don't work.  Add
sudo to the base image.

Change-Id: I7014d8cbd90288456e5ab3badcd601ef9cdd0c87
Partially-Implements: blueprint rhel-based-image-support

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