Re: [jclouds] Address FindBugs issues and disable some detectors (#498)

[Andrew Gaul]

>           return false;
> -      return Objects.equal(this.toString(), that.toString());
> +      if (!(obj instanceof Node)) {
> +         return false;
> +      }
> +      Node that = (Node) obj;
> +      return Objects.equal(this.id, that.id)

Correct.  Note that some tests actually fail when I included `credential` and 
`credentialUrl`.

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