[PATCH][REORG/MINOR]: config: Run postparser once per section instance

[Ben Draut]

This changes the parser to run section postparsers once per section
instance, rather than only when the section type changes.

This is motivated by the work discussed in
https://www.mail-archive.com/haproxy@formilux.org/msg29527.html. It should
make it easy to produce the warning mentioned in the summary at most once
per section.

Thanks,

Ben

0001-REORG-MINOR-config-Run-postparser-once-per-section-i.patch
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