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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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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