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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test 2081: add a valid reply for the second request

... so the test works when using a HTTP proxy like
Privoxy that sends an error message if the server
doesn't send data.

C

test 2081: add a valid reply for the second request

... so the test works when using a HTTP proxy like
Privoxy that sends an error message if the server
doesn't send data.

Closes #8959

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transfer: strip credentials from the auto-referer header field

Added test 2081 to verify.

CVE-2021-22876

Bug: https://curl.se/docs/CVE-2021-22876.html