Support HTTPS records in dnsd that have ALPN preferences.
Add pytest test_22_* to verify that HTTPS record ALPN
preferencces take effect if the HTTPS resolve arrives in time.
Fix HTTPS eyeballing use of timeouts for second attempt. Also,
make an initial HTTP/1.1 attempt switch off HTTP/2.
Closes#21329
Add "Delay-A: ms", "Delay-AAAA: ms" and "Delay-HTTPS: ms" to the test
dnsd config and implement delayed response handling.
Add test_21_09 and test_21_10 to check that delayed responses connect
using the undelayed address family.
Closes#21299
