typica does not have RHEL machines, some tests require it
Typica does not have RHEL machines right now, and it's not clear if it ever will. Most of our yaml tests either do not have OS requirements or require the Ubuntu family, but there is one exception: suites/rados/thrash-erasure-code-isa/distros/rhel_7.0.yaml
That test when run on typica simply takes up a worker until timeout; at time of posting there are several which you can find on pulpito-rdu by looking at the rados test waiting machines.
I'm not sure if there's a good way to exclude only this fragment from typica, or if we need to do something else. Loic set it up so he's a good reference point for the purpose of the test in evaluating options.