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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altsvc: accept and parse IPv6 addresses in response headers

Store numerical IPv6 addresses in the alt-svc file with the brackets
present.

Verify with test 437 and 438

F

altsvc: accept and parse IPv6 addresses in response headers

Store numerical IPv6 addresses in the alt-svc file with the brackets
present.

Verify with test 437 and 438

Fixes #11737
Reported-by: oliverpool on github
Closes #11743

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