console.info messages are not shown in Debugger Console

1. Open the project simpleQuickUI2 from Creator's repository.
   It's in tests/system/suite_debugger/shared/testdata/simpleQuickUI2/simpleQuickUI2.qmlproject
2. Run the project in the debugger.
3. In "Locals" view, select the root node "Rectangle" (QQuickView with Qt 5.10.1).
4. Show the Debugger Console.
5. Make sure that all message types are selected in the Console icon bar, so all messages should be shown.
6. Type console.info("message") into the Console and press Enter.
   The results vary depending on the platform and the Qt version used to run the project:

   	Qt 5.3.1	Qt 5.4.1	Qt 5.6.1	Qt 5.10.1
   Ubuntu 16.04 LTS 64 bit
   Ubuntu 17.10 64 bit

   In all these cases, these message is being written to the Application Output view.
   I did not build those Qt packages and the used Creator myself but used the official installers (gcc_64).

console.info messages should be shown, regardless of the platform and Qt version.

Found when updating Squish test tst_qml_js_console.