Remove unused arg from make_class_properties.getter method

This patch simply cleans up an unused argument (typefn) from the
nova.objects.base#make_class_properties.getter method.

Change-Id: I6a1bd927bb799d00cc6f0b250609e90e3838fa29
Merge "Remove unused arg from make_class_properties.getter method"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp