tests: Activate test_hash_in and apply workaround
tests: Activate test_hash_in and apply workaround

Work around pygobject's current inability to produce a GStrv object from a
string array by explicitly producing a GStrV object, and reactivate test case.

https://bugzilla.gnome.org/show_bug.cgi?id=666636

MathieuDuponchelle/pygobject,pexip/pygobject,sfeltman/pygobject,MathieuDuponchelle/pygobject,jdahlin/pygobject,thiblahute/pygobject,pexip/pygobject,jdahlin/pygobject,davidmalcolm/pygobject,choeger/pygobject-cmake,davibe/pygobject,davibe/pygobject,thiblahute/pygobject,thiblahute/pygobject,davidmalcolm/pygobject,GNOME/pygobject,pexip/pygobject,choeger/pygobject-cmake,davibe/pygobject,davidmalcolm/pygobject,sfeltman/pygobject,jdahlin/pygobject,GNOME/pygobject,MathieuDuponchelle/pygobject,sfeltman/pygobject,davibe/pygobject,choeger/pygobject-cmake,GNOME/pygobject