Prevents SLCLI_VERSION environment variable from breaking things #1527
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Fixes #1524
Apparently Click has a neat feature that allows you to set parameters with environment variables, which I just learned about.
https://github.com/softlayer/softlayer-python/blame/master/SoftLayer/CLI/core.py#L103 is what actually controls that, but since its been active for 3 years, I don't really want to turn it off entirely, as it is a somewhat neat feature.
So I'll just turn it off for --version which I don't think anyone would want to have automatically be set.