Lua up checks: finer control

[miodvallat]

Short description

This PR introduces two new options to the if*up Lua functions:

• interval, if provided, overrides the global lua-health-checks-interval value for this particular test.
• minimumFailures, if provided, is the number of unsuccessful checks in a row required to mark the address as down. The default is 1, which matches the current behaviour of marking an address as down at the first unsuccessful check.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)

[coveralls]

Pull Request Test Coverage Report for Build 12513391980

Details

• 0 of 39 (0.0%) changed or added relevant lines in 1 file are covered.
• 28 unchanged lines in 11 files lost coverage.
• Overall coverage increased (+0.001%) to 64.807%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pdns/lua-record.cc	0	39	0.0%

Files with Coverage Reduction	New Missed Lines	%
pdns/lua-record.cc	1	0.2%
pdns/packethandler.cc	1	72.44%
pdns/recursordist/syncres.cc	1	80.16%
pdns/validate.cc	1	68.19%
pdns/pollmplexer.cc	1	83.66%
pdns/recursordist/recursor_cache.cc	1	84.2%
pdns/remote_logger.cc	3	54.26%
pdns/dnsrecords.cc	3	80.33%
pdns/recursordist/rec-tcp.cc	4	65.63%
pdns/dnsdistdist/dnsdist-carbon.cc	6	63.2%

Totals
Change from base Build 12496898214:	0.001%
Covered Lines:	126120
Relevant Lines:	163793

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💛 - Coveralls