tests: update some HTTP/2 over HTTPS tests

- improve descriptions
- require http/2, not h2c, since they are done over HTTPS

Closes #15317

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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