tests: ignore QUIT from FTP protocol comparisons

- QUIT is not an important FTP command
- curl only sends it "best effort", meaning it might not be sent
- it is a known "flaky" thing

tests: ignore QUIT from FTP protocol comparisons

- QUIT is not an important FTP command
- curl only sends it "best effort", meaning it might not be sent
- it is a known "flaky" thing in test output because of this

Closes #14404

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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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test416: verify growing FTP file support

Added setting: RETRSIZE [size] in the <servercmd> section. When set this
will cause the test FTP server to return the size set (rather than the

test416: verify growing FTP file support

Added setting: RETRSIZE [size] in the <servercmd> section. When set this
will cause the test FTP server to return the size set (rather than the
actual size) in the acknowledgement from a RETR request.

Closes #9772

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