Apparently, it is not enough to just retry 10 times (10 seconds) in the
CI network. It happens from time to time that a test fails due to server
port is unreachable. Especially, the docker containers are running in a
virtual machine on Windows and macOS platforms. In such cases, it needs
more time to warm up the service depending on the system loading.
Change-Id: Ia0234bff2a82988b62f451e20b50671708784008
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@qt.io>