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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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

test412/413: Use version macro for User-Agent

Commit 46d45ea3a incorrectly hardcoded the User-Agent in the test
output file which breaks when curlver is updated. Shift to using
the %

test412/413: Use version macro for User-Agent

Commit 46d45ea3a incorrectly hardcoded the User-Agent in the test
output file which breaks when curlver is updated. Shift to using
the %VERSION macro instead.

Closes: #8856

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test412/413: verify alt-svc with trailing dots