tests: replace nokia with qtproject in tst_qdeclarativemoduleplugin

Change-Id: Ia531065e3069aa010f99f91a8c8228788b3f0848
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
use private linkage where possible

Change-Id: Ia64fcacff77933a00df6eecd866f75466f4f99a3
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
tests: fix tst_qdeclarativemoduleplugin::incorrectPluginCase()

It gives different error message based on the case sensitivity of
the file system on Mac.

Task-number: QTBUG-32646
Change-Id: I8b5986a4bc8886924e678692c6679e571a11dd33
Reviewed-by: Alan Alpert (Personal) <416365416c@gmail.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I6556b93b0897a2df48a68238b8ab150541fcbb3f