Improve error handling around setting ulimits
The log messages about open file limits have always been slightly opaque and confusing. Here's an attempt to fix their wording, detail, and meaning. Users will have a better understanding of how to fix very common problems with these reworded messages. Also, we handle a new error case when maxclients becomes less than one, essentially rendering the server unusable. We now exit on startup instead of leaving the user with a server unable to handle any connections. This fixes antirez#356 as well.
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