tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

test1671: fix after fix

tests: fix tag syntax errors in test files

curl/header_json: output the header names in lowercase

To better allow json[“header”].

Reported-by: Peter Korsgaard
Bug: https://daniel.haxx.se/blog/2022/03/24/easier-header-pic

curl/header_json: output the header names in lowercase

To better allow json[“header”].

Reported-by: Peter Korsgaard
Bug: https://daniel.haxx.se/blog/2022/03/24/easier-header-picking-with-curl/comment-page-1/#comment-25878
Closes #8633

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configure: add --enable-headers-api to enable the headers API

Defaults to disabled while labeled EXPERIMENTAL.

Make all the headers API tests require 'headers-api' to run.

test1671: verify -w '%{header_json}