Fix store of answers on Python3.6 (DictProxy)

[pirat89]

On Python3 the loaded answer is "sometimes" represented by DictProxy object. In such a case the answer cannot be serialized into the JSON object and storing into the audit db fails with crash.

"sometimes" ==> I have a suspicion the result is different in case the answer is loaded from the answerfile and userchoices file.

See: https://github.com/oamg/leapp-repository/pull/821

Note: This is not a proper fix. I am sending the commit from a train with unstable network.

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[centos-ci]

Can one of the admins verify this patch?

[fernflower]

I'd say this is the proper fix https://github.com/oamg/leapp/pull/760

[pirat89]

Closing it in favor of #760

btw, I am hitting it now in 100% cases on Py3 with dialogs. I have no idea how I passed through it earlier this day when the dialog has been raised. the object is DictProxy all the time the question is answered.