Use logging message format with args, instead of direct `%` or `str.format`. Resolve #855.  | 
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|---|---|---|
| .. | ||
| files | ||
| __init__.py | ||
| debootstrap.py | ||
				Use logging message format with args, instead of direct `%` or `str.format`. Resolve #855.  | 
			||
|---|---|---|
| .. | ||
| files | ||
| __init__.py | ||
| debootstrap.py | ||