Change deprecated use of CONFIG+=qtestlib to QT+=testlib
Change deprecated use of CONFIG+=qtestlib to QT+=testlib

qtestlib.prf was deprecated by 812adb58ba714c69eea9249584da2efd4fedecbc

Change-Id: Ia6b145c6185858a95d74a78cf1f186a23490bd2a
Reviewed-by: Oswald Buddenhagen <6a8868beda3e139b5ac22b2534a23d3e6ba81819@nokia.com>

tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa