resize: Rearrange objects.

This is just build refactoring.
resize, builder: Improve speed by using cache=unsafe on newly created files.

However because qemu might open these files immediately afterwards
using cache=none, we have to sync the file before exiting.
appliance: Add comments to init script.
appliance: When valgrinding daemon + error path, sleep so valgrind messages are seen.
Version 1.24.0.

New stable branch.
Version 1.25.0.