Revert "Message for incubating execution mode is not shown if the mode is explicitly configured (e.g. gradle.properties)."

This reverts commit 7fa641429cdd04a00f8bdf3f6364909fbd32a5ae.

It didn't work for the daemon execution and I wasn't happy with the implementation, too.
Tweaked the incubating message a tiny bit. The parallel mode and configuration on demand are now printed as a single line if both modes are enabled.