[Issue]: Use cdrom build instead of url for all RHEL 7 derivatives kickstart files

[uroesch]

What went wrong?

Use cdrom for the installation media on all RHEL 7 builds and derivatives in the kickstart file to speed up the build process.

Specify the build host system.

n/a

Are you building with docker?

• Yes

Operating System with Errors

CentOS 7.x, Oracle Linux 7.x, Red Hat Enterprise Linux 7.x

Which generated disk image is not working?

QCOW2 (KVM, QEMU, Proxmox)

Relevant log output

n/a