Keep using iptables for compatibility with our scripts using iptables.

Printing the string "Build successful, connect to:" in the logs is the
success flag when running Test Suites.

fixup! for b31bcacd

Fix up e4f1ee5f (Fix up: update variables too.)

Fix up ff0face8 (Update package names.)

when cpufreq/scaling_governor doesn't exit rc doesn't exist because command is
skipped

This package is already a dependency of slapos-node.

This commit adds support for Fedora because the package name is
different on Fedora (lm_sensors).

The command lsb_release must be present on the system to have a working
anisble_lsb dictionary

Remove every old tarballs in OBS directory. Otherwise OBS does not know
which to choose for compilation.

prevents vifib.yml playbook from failing for machines containing offline CPUs