[REG 5.6.1-1 -> 5.7.0] Massive command line output when opening tutorial

1. Build Creator on Qt 5.7.0 and start it from the command line.
2. Go to Welcome mode, Tutorials tab.
3. Click on "Getting Started Programming with Qt Quick".
   Creator will write a massive log to the command line.

This output does not seem helpful for a user. Either it is meant for the user, then it should be more clear. Or it is meant for developers, then it should be hidden, if needed after fixing the root cause.
With the same Creator built on Qt 5.6.1, this output is not being written.