For all tests using -O that were previously relying on a debug build and
the CURL_TESTDIR environment variable, use the plain --output-dir option
instead so that they can run proper in non-debug builds.
Closes#15114
- 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
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
