(ci): adding new packages in cuup dockerfiles
- Added iproute2 package in Ubuntu20.04 and Redhat images
- Added net-tools package in Ubuntu20.04
- Removed rfsim option from cu, cu-cp and cu-up because it is not needed
Maintenance operation of our GitLab server is scheduled for Thursday, November 28 at noon. The server will be unavailable for about two hours.