[Rpm-maint] [rpm-software-management/rpm] Add ternary operator support to expression parser (#838)

[pavlinamv]

I think that adding ternary operator support to the expression parser is useful and it will not cause problems in the parsing of the existing expressions. 

There is one thing that can be improved -cases like:
 ```
--eval '%{expr: 1 ?}'
--eval '%{expr: 0 ? 3 : }'
```

  returns an error, but without any message. It can be improved.

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