tor/changes/bug13111-generate-keys-on-empty-file

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o Minor bugfixes (file handling):
- Stop failing when key files are zero-length. Instead, generate new
keys, and overwrite the empty key files.
Fixes bug 13111. Patch by "teor".
- Stop generating a fresh .old RSA key file when the .old file is missing.
- Avoid overwriting .old key files with empty key files.
- Stop crashing when a NULL filename is passed to file_status().
Fixed as part of bug 13111. Patches by "teor".
o Minor enhancements (file handling):
- Skip loading zero-length extra info store, router store, stats, state,
and key files.
- Return FN_ERROR when a zero-length filename is passed to file_status().
Fixed as part of bug 13111. Patches by "teor".
o Minor enhancements (testing):
- Test that tor does not fail when key files are zero-length.
Check that tor generates new keys, and overwrites the empty key files.
- Test that tor generates new keys when keys are missing (existing
behaviour).
- Test that tor does not overwrite key files that already contain data
(existing behaviour).
Tests bug 13111. Patch by "teor".