Review operating systems distribution

## Expected Behavior
Currently the crawler is pulling a count for the `operating systems distribution` metric which should be re-evaluated in how it gets this number. This should also be explained on the UI as the large number of `unknown` makes this metric useless.

If this metric cannot be accurately predicted/scraped, we should remove it from node statistics.

## Current Behavior
High number of "unknown" OS distributions. Doesn't make this useful.

## Possible Solution
Let's re-analyze how this is captured and see if there is a way to crawl for better metrics in this section.