truncate files if append is disabled #882
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What this PR does / why we need it:
Fixes cloud init write_files section when file already exists and append mode is disabled. Right now it only overwrites the first characters of an existing file, which may cause the file to become corrupted
Which issue(s) this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)
format, will close the issue(s) when PR gets merged):Fixes #
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