tests: check http/2 and http/3 server responsiveness

Check responsiveness of http/3 server when running.

Also, a test case with http/2 or http/3 server requirement
now implicitl

tests: check http/2 and http/3 server responsiveness

Check responsiveness of http/3 server when running.

Also, a test case with http/2 or http/3 server requirement
now implicitly drags in a 'http' server and we need no longer
mention that in testdata.

Closes #15058

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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: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

tests: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

Closes #10114

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