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

test897: verify delivery of IMAP post-body header content

The "content" is delivered as "body" by curl, but the envelope continues
after the body and the rest of it should be delivered a

test897: verify delivery of IMAP post-body header content

The "content" is delivered as "body" by curl, but the envelope continues
after the body and the rest of it should be delivered as header.

The IMAP server can now get 'POSTFETCH' set to include more data to
include after the body and test 897 is done to verify that such "extra"
header data is in fact delivered by curl as header.

Ref: #7284 but fails to reproduce the issue

Closes #7748

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