This change frees the tests of their dependence on the Qt internal test
server (qt-test-server.qt-test-net). It makes the developers run the
tests out of Qt testing infrastructure.
If the user has installed Docker engine on their host, the test servers
will be built up inside separate Docker containers, and then, the test
case goes with the Docker-based test servers. Otherwise, the test case
will keep using the Qt internal test server.
Task-number: QTQAINFRA-1686
Change-Id: I518bc3675bfd658938509744b0e7e0610bc8bf66
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@qt.io>
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