Support Installing on non linux platforms

[csoleimani]

Hi, Could MacOS support get added to this since Sensu also has a Mac client now?

I get a dependency error with linux-kstat on MacOS

[majormoses]

It looks like it only used by this check: https://github.com/sensu-plugins/sensu-plugins-cpu-checks/blob/1.1.2/bin/metrics-cpu-mpstat.rb unforunately removing the check is not something we would do lightly especially considering that the number of linux systems being monitored far outweigh any other platform. I will have to look more to find a viable go forward path and I imagine this lies with writing a ruby extension to conditionally add the dependency on linux during install time rather than build time but I am sure that will not be a very popular stance as it will require a c compiler.

[mattyjones]

I am taking this on and will explore refactoring this out and returning it to full portability when I have merged and released the updates to the Gems.

[majormoses]

an option although kinda messy