StoreRepoObject in util/commandline.py fails to handle both repo config object and actual repo objects at the same time

[radhermit]

Repo config objects are passed when using something like pmaint sync gentoo while raw repo objects are passed when using something such as pinspect eclass_usage gentoo. This causes issues since in once the the aliases attribute is a dict and in the other it's a tuple.

We should either only pass one type of repo object, use similar types of the aliases attribute, or conditionalize the object loading method that tries to iterate over available aliases.