utils: Support G_TYPE_STRING in _set_property_value_from_type()
utils: Support G_TYPE_STRING in _set_property_value_from_type()

Signed-off-by: Eduardo Lima (Etrunko) <025eb0974a9f48eaca88b86d8c2bcaf361e95a91@redhat.com>

etrunko/libgovirt,etrunko/libgovirt,GNOME/libgovirt