modules/hints: allow overriding the TTL

Fixes #442 (closed).

To consider:

• exactly this API?
• perhaps change the default to 5s or something?
• add corresponding NEWS entry.
• tests; TTL in hints doesn't seem important at all

What do you think?

error: using integer absolute value function 'abs' when argument is of floating point type

-Wpedantic

added feature label

Given that you already wrote the code, okay, but I do not like extending hints module. I think it would be better to replace it with a variant of zimport, possibly with new rank like RANK_AUTH which does not expire or something like that.

changed the description

marked the checklist item exactly this API? as completed

added 4 commits

• 9d2b04ed...ef0bc449 - 2 commits from branch master
• a4d732c5 - modules/hints: allow overriding the TTL
• 98340eda - modules/hints: change default TTL to 5s, add NEWS

Compare with previous version

marked the checklist item perhaps change the default to 5s or something? as completed

marked the checklist item add corresponding NEWS entry. as completed

changed the description

added 1 commit

• babf50c9 - dns64 tests: fix by setting hints.ttl() explicitly

Compare with previous version

marked the checklist item tests; TTL in hints doesn't seem important at all as completed

enabled an automatic merge when the pipeline for babf50c9 succeeds

Hmm, the segfault in resperf is worth investigating, even though I find it unlikely to be related to changes in this MR.

added 35 commits

• babf50c9...f4ae1631 - 32 commits from branch master
• fad65bb6 - modules/hints: allow overriding the TTL
• becabe29 - modules/hints: change default TTL to 5s, add NEWS
• bee22317 - dns64 tests: fix by setting hints.ttl() explicitly

Compare with previous version

mentioned in commit 1aabd4a9

merged