bots: Add workaround for broken RPM key on rhel-x
bots: Add workaround for broken RPM key on rhel-x

There is something about /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-AUX-2018
that dnf/PackageKit don't like. Remove this file to work around this
bug: https://bugzilla.redhat.com/show_bug.cgi?id=1624862

This unbreaks a lot of PackageKit related operations.

Closes #9968

garrett/cockpit,garrett/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpituous/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,andreasn/cockpit,andreasn/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,andreasn/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,garrett/cockpit,mvollmer/cockpit,deryni/cockpit,cockpit-project/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,mvollmer/cockpit,andreasn/cockpit,cockpit-project/cockpit,andreasn/cockpit,martinpitt/cockpit,martinpitt/cockpit,deryni/cockpit,mvollmer/cockpit,andreasn/cockpit,deryni/cockpit,cockpit-project/cockpit,deryni/cockpit,andreasn/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit