Re: t0301-credential-cache test failure on cygwin

> Of the three, I actually like the client-side one to check errno the
> best. The client is mostly "best effort". If it can't talk to the daemon
> for whatever reason, then it becomes a noop (there is nothing it can
> retrieve from the cache, and if it's trying to write, then oh well, the
> cached value was immediately expired!).
>
> So one could argue that _every_ read error should be silently ignored.
> Calling die_errno() is mostly a nicety for debugging a broken setup, but
> in normal use, the outcome is the same either way (and Git will
> certainly ignore the exit code credential-cache anyway). I prefer the
> "ignore known harmless errors" approach, possibly because I am often the
> one debugging. ;) If ECONNABORTED is a harmless error we see in
> practice, I don't mind adding it to the list (under the same rationale
> as the current ECONNRESET that is there).