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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tool_getparam: initial --json support

Adds these test cases:

383 - simple single command line option
384 - reading it from stdin
385 - getting two --json options on comma

tool_getparam: initial --json support

Adds these test cases:

383 - simple single command line option
384 - reading it from stdin
385 - getting two --json options on command line
386 - --next works after --json

Closes #8314

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