Revert "Revert change maybe to use dnf instead of yum"
Revert "Revert change maybe to use dnf instead of yum"

This reverts commit 95f1417905f5e64428415a9103742e71c6a1ada8.

Trophime/singularity,Trophime/singularity,Trophime/singularity,Trophime/singularity