Add QtEnginio dev,stable and release to CI instead of master

Change-Id: I80bb9201f4f71dfec87b65bd980e4a78d097a2b1
Reviewed-by: Simo Fält <simo.falt@digia.com>
Testconfig: Adding QWebChannel to CI

New qt-labs submodule to CI. Default stages with forced to succeed and
ignoring test results. After passing CI for the first time, make sure
the stages gets enforced.

Change-Id: I580eb341fee724369325f85a2147197ea5bf6863
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>