Remove extra configurations for Enginio credentials

This configuration has been added to Qt_Modules_Continuous_Integration
so we can remove this from Qt5 and QtEnginio dev/stable/release

Change-Id: Ifd83f3c98b0b4eb3cfd6b84f3f1fab35aeac437e
Reviewed-by: Simo Fält <simo.falt@digia.com>