Fully clean Python examples and test-suite

Examples/python/import_packages/Makefile

@@ -35,6 +35,11 @@ static:
 
 clean:
 	$(MAKE) -f $(TOP)/Makefile SRCDIR='$(SRCDIR)' python_clean
+	if test "x$(SRCDIR)" != x; then \
+		for file in `cd $(SRCDIR) && find . -type f -name __init__.py`; do \
+			rm -f "$$file" || exit 1; \
+		done; \
+	fi; \
 	for s in $(import_packages_subdirs); do \
 		(cd $$s && $(MAKE) clean); \
 	done