libknot/packet: compression algorithm improved

The previous compression algorithm does not compress everything it can in cases where there are domain names in the data section of a RR, e.g. when the answer contains

bar.example.com CNAME foo.example.com foo.example.com A 192.0.0.2

and foo.example.com was not encountered previously, then the second RR leaves the 'foo' part uncompressed.

The improvement resolves some of these cases by comparing the owner of a new RRset to be written with the last written dname instead of QNAME. Also, the effectivity was slightly increased according to benchmarks.

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• 1d36c124...abd21e95 - 8 commits from branch master
• d5fa3910 - libknot/packet: compression algorithm improved

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added 2 commits

• ab3b6e9a - libknot/packet: compression algorithm improved
• b02164e9 - libknot: optimize code order in knot_pkt_put

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enabled an automatic merge when the pipeline for b02164e9 succeeds

merged

mentioned in commit ecc81f16

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