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: fix TFTP test 2305 on Windows

Ref: #13692
Closes #13724

tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

test2305: send 3 frames, 4097 bytes each, as one message

Receive them using a 256 bytes buffer in a loop.