Fixed linter issues in `daemon/lua`, added more config tests

This fixes a bunch of linter issues in daemon/lua and adds a basic config test to check constants / rrsets still work. Notable change is that library requires at least libknot 2.4.0 (which is already in Debian stable).

added 9 commits

• 1da90947...1f605195 - 7 commits from branch fix-predict-module
• adfce010 - added basic config test for consts, depend on knot >= 2.4, cleanup
• 99b34a9d - daemon/lua: fixed unused variables, whitespace, cleanup

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added 4 commits

• 99b34a9d...6cb6508a - 2 commits from branch fix-predict-module
• fb024938 - added basic config test for consts, depend on knot >= 2.4, cleanup
• d1272306 - daemon/lua: fixed unused variables, whitespace, cleanup

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added 4 commits

• d1272306...a395e9a2 - 2 commits from branch fix-predict-module
• c07dd332 - added basic config test for consts, depend on knot >= 2.4, cleanup
• 694b0605 - daemon/lua: fixed unused variables, whitespace, cleanup

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added 1 commit

• 26b197c9 - 1 commit from branch fix-predict-module

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added 3 commits

• 26b197c9...f680e0c5 - 3 commits from branch fix-predict-module

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changed the description

changed target branch from fix-predict-module to master

enabled an automatic merge when the pipeline for f680e0c5939c4e0d104ef5b61c51e44e558c6768 succeeds

canceled the automatic merge

added 2 commits

• b90e6c71 - added basic config test for consts, depend on knot >= 2.4, cleanup
• 3162da83 - daemon/lua: fixed unused variables, whitespace, cleanup

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Rebased to master.

added 2 commits

• 0489e21c - fixed obvious linter problems
• 505adec4 - Merge branch 'fix-obvious-linter-problems' into 'daemon-lua-linter-fixes'

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enabled an automatic merge when the pipeline for 505adec4 succeeds

merged

mentioned in commit e95643d1