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WIP: Detect attempts to add duplicate RR into DNS messages

Petr Špaček requested to merge doubled_rr into master

Deckard is using DNS python library to construct DNS messages. The library automatically detects attempt to add duplicate RR into RRset and silently merges the two.

Now the code detects this unsupported operation and refuses to load the entry. Tests which use duplicate RRs have to be re-written using RAW method.

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