Fix validation logic in the base consumer
The base consumer is intended to only derive its validation switch from the on-disk configuration if the child class doesn't override the validate_signatures switch.
There was a bug here where the default value provided in the base class made it appear as if all child consumers had turned off validation, which is incorrect.
This fix turns on signature validation by default while preserving the ability of child consumers to override the on-disk configuration in special cases.
sudo dnf upgrade --advisory=FEDORA-2017-a73bc7ac5d
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