TripleO already manages firewall rules so we don't need to have both
enabled in the same time.
It's currently not an issue because the firewall rules aren't apply by
ceph-ansible on containerized deployment but it will be enabled soon.
Change-Id: I2b8fc3fcf757e5a24696f2d3575fe696b9cdfdf0
Co-Authored-By: Dimitri Savineau <dsavinea@redhat.com>