tests: propagate errors in libtests

Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly w

tests: propagate errors in libtests

Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly why a test has failed.

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tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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spelling: use 'reuse' not 're-use' in code and elsewhere

Unify the spelling as both versions were previously used intermittently

Closes #11717

test2306: make it use a persistent connection

+ enable verbose already from the start

Closes #11621

headers: accept leading whitespaces on first response header

This is a bad header fold but since the popular browsers accept this
violation, so does curl now. Unless built with hyper.

headers: accept leading whitespaces on first response header

This is a bad header fold but since the popular browsers accept this
violation, so does curl now. Unless built with hyper.

Add test 1473 to verify and adjust test 2306.

Reported-by: junsik on github
Fixes #11605
Closes #11607

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test2306: verify getting a second response with folded headers

Reproduces the isue #11101 and verifies the fix.

Verifies a17b2a503f