dnsdist-2.1: Backport 17747 - Gracefully handle errors in DynBlock's suffix match policy

[rgacogne]

Short description

Backport #17747 to dnsdist-2.1.x

There is no need to stop the whole processing if we choked on one entry, or even could not properly insert one new rule.

Checklist

I have:

• read the CONTRIBUTING.md document
• read and accepted the Developer Certificate of Origin document, including the AI Policy, and added a "Signed-off-by" to my commits
• 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)
• checked that this code was merged to master

[coveralls]

Coverage Report for CI Build 32744122840

Coverage decreased (-0.01%) to 68.87%

Details

• Coverage decreased (-0.01%) from the base build.
• Patch coverage: 8 uncovered changes across 1 file (22 of 30 lines covered, 73.33%).
• 3 coverage regressions across 2 files.

Uncovered Changes

File	Changed	Covered	%
pdns/dnsdistdist/dnsdist-dynblocks.cc	30	22	73.33%

Coverage Regressions

3 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
pdns/dnsdistdist/dnsdist-async.cc	2	77.04%
pdns/dnsdistdist/dnsdist-dynblocks.cc	1	65.8%

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Coverage Stats

Relevant Lines:	71341
Covered Lines:	54397
Line Coverage:	76.25%
Relevant Branches:	30998
Covered Branches:	16084
Branch Coverage:	51.89%
Branches in Coverage %:	Yes
Coverage Strength:	2239448.07 hits per line

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💛 - Coveralls