This was the first time I had received such a request. I therefore edited /etc/selinux/config and set SELINUX=enforcing and then made selinux relabel the entire filesystem with fixfiles relabel (and said y to deleting all the files in /tmp). After the relabeling, you must reboot the system.
However after enabling SELINUX, the system integration company working on the project complained that they were getting permission denied errors for the kvm kernel module. I was able to get things working again after editing /etc/libvirt/qemu.conf and uncommenting the line:
security_driver = "selinux"
and then restarting libvirtd with systemctl restart libvirtd
In hindsight, I think the client might have run into the following issue when trying to install Redhat Distribution of Openstack (RDO) with SELINUX set to disabled:
The solution is to enable SELinux in permissive mode (if there is a reason not to have it in enforcing mode).