Document set/get vars in python api

[inknos]

I believe this should be documented in the api, but not as part of the main workflow.

I propose to keep it commented as optional steps to show how to address getting/setting vars, but not as part of the workflow until we create an example that uses it.

Maybe a specific example in the future?

relates to #241

[j-mracek]

I believe that currently this approach does not work. vars.get('releasever') returns something like a pair, but a structure is unknown in python, therefore you cannot use it at all (bug) . What about to describe - get_priority and get_value? Hope that get priority works

[j-mracek]

I am sorry - my previous comment was incorrect - get_priority() is not available method for Vars

Get() returns Vars structure that contains

    struct Variable {
        std::string value;
        Priority priority;
    };

[j-mracek]

Because get() approach is not working - ok working but not useful - I would recommend to remove example with get() and add todo - provide a way how to get option priority. What do you think?

[j-mracek]

@inknos May I ask you what's yours plans?

[j-mracek]

LGTM