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

curl: error out if -T and -d are used for the same URL

As one implies PUT and the other POST, both cannot be used
simultaneously.

Add test 378 to verify.

Reported-by: B

curl: error out if -T and -d are used for the same URL

As one implies PUT and the other POST, both cannot be used
simultaneously.

Add test 378 to verify.

Reported-by: Boris Verkhovskiy
Fixes #8704
Closes #8715

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