As it was superseded by HTTP/2. Bye, Speedy. Since it's Qt 6,
we also fix the attribute's enumerator to fit our coding
convention with HTTP2AllowedAttribute becoming Http2AllowedAttribute,
and the same for HTTP2WasUsedAttribute.
tst_qnetworkreply in 'benchmark' directory of qtbase/tests
was updated - we have the logic they tested in preConnectEncrypted
in tst_http2 now.
Manual qnetworkreply test was updated (instead of SPDY in NPN failure
we can use H2, the second test was deleted - again, auto-tested in
tst_http2).
Change-Id: I559c140c333ddf72664911c6e275b1d0d2b980a9
Task-number: QTBUG-78255
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
13e0a36626