Because we will do a small wait after the final connection (to see
if there are any unexpected extra connections) we can save some time
by reducing _how long_ we wait for it.
In general we only need an extra long wait for the first connection,
subsequent connections are faster.
So we change the loop structure from looping until we hit 20(!)
connections, when anything larger than 6 will fail the test anyway!
And use qWaitFor instead of repeatedly calling enterLoop and checking
the state of an ElapsedTimer, the total wait time is not super
interesting, and made it a guarantee that the test would take 10
seconds.
While we are here, update the attribute we use to test HTTP/2
connections. We were previously enabling http/2, but this is the new
default so it's not needed. We do, however, need to enable h2c if we
want to see it trying to upgrade to http/2 over cleartext.
Not a big issue, so we don't pick it very far back.
Pick-to: 6.7
Change-Id: Ia314ae2827ab8a8baaa4af2c5136c5e531bcb1f8
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
8de1ed8979