tests: add codeset-utf8 as a feature

To avoid having to use <precheck> for tests that require UTF-8 support.

Closes #15039

tests: sync feature names with `curl -V`

Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
res

tests: sync feature names with `curl -V`

Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
results easier to grok.

Closes #14183

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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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tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

ftpserver: don't verify SMTP MAIL FROM names

Rely on tests asking the names to get refused instead - test servers
should be as dumb as possible. Edited test 914, 955 and 959 accordingly.

ftpserver: don't verify SMTP MAIL FROM names

Rely on tests asking the names to get refused instead - test servers
should be as dumb as possible. Edited test 914, 955 and 959 accordingly.

Closes #5639

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tests: disable SMTP UTF-8 tests on Windows

Fixes #4988
Closes #4992

smtp: Support UTF-8 based host names in the MAIL command

Non-ASCII host names will be ACE encoded if IDN is supported.

smtp: Added UTF-8 mailbox tests to verify existing behaviour