cache.clear('name') edge cases

Fixes https://gitlab.labs.nic.cz/knot/knot-resolver/issues/401

I'm not really sure if rettable.subtree should contain the ffi.string() result or a tostring() from it, but I left it as it was (the former).

I believe the pipeline is good.

@pspacek: want to have a look as well, or shall I just merge?

added 1 commit

• 39369ab7 - cache.clear('name'): fix a small GC race

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resolved all discussions

added 10 commits

• 39369ab7...88e78c66 - 7 commits from branch master
• ad263d73 - kres.str2dname: perform lower-casing
• 56cf1927 - cache.clear('name'): correct the 'not_apex" warning
• eb868bc3 - cache.clear('name'): fix a small GC race

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changed the description

added 77 commits

• eb868bc3...367a9070 - 74 commits from branch master
• 23d5b99d - kres.str2dname: perform lower-casing
• 4d91c80a - cache.clear('name'): correct the 'not_apex" warning
• 5e73af5d - cache.clear('name'): fix a small GC race

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enabled an automatic merge when the pipeline for 5e73af5d succeeds

merged

mentioned in commit 81dffe33