use correct reference for anaconda version
nameservers are a list (using this as values of a hash fails on older
perl)
/var/lock (as part of default lockdir) can be volatile
behave as spma proxy (using a proxy for a repo that is not proxied,
might return an error html page, and yum doesn't like that in el7rc as
the repo is considered initialised (skip_if_unavailable only deals with
initialisation) with unusable repodata)
this is what spma does
introduce packagesinpost boolean
unittests for packagesinpost
en empty %packages section is required with packagesinpost