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

show more ...

tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

test978: mark file as text mode

Follow-up to 4ea5702980cb

To fix test failures on Windows

Closes #10594

test978: verify that --stderr works for -w's stderr as well