tor/changes/bug2385

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o Minor features (security):
- Clear keys and key-derived material left on the stack in
rendservice.c and rendclient.c. This should make us more
forward-secure against cold-boot attacks and the like. Fix for
bug 2385.
- Check return value of crypto_pk_write_private_key_to_string() in
end_service_load_keys(). This should make us more forward-secure
against cold-boot attacks and the like. Fix for bug 2385.