Ensure serviceframework plugin lookup behavior remains compatible
Ensure serviceframework plugin lookup behavior remains compatible

We can't just append "/serviceframework" to the lookup paths,
since binaries already deployed in say "/usr/lib/qt/plugins"
will no longer be searched for. So search in the
standard lookup paths and then search through then again but
with "/serviceframework" appended.

Task-number: MOBILITY-1191
Reviewed-by: Andrew Stanley-Jones

qtproject/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,KDE/android-qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,KDE/android-qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,KDE/android-qt-mobility,tmcguire/qt-mobility,KDE/android-qt-mobility,tmcguire/qt-mobility