[bug] exclude iowait, steal, idle from CPU uages

[jkroepke]

Describe the bug

Based on

• mixin: exclude iowait and steal from CPU Utilisation prometheus/node_exporter#2194
• CPU steal time shouldn't be counted into CPU usage prometheus-operator/kube-prometheus#796
• dashboards/resources: exclude iowait and steal from CPU Utilisation kubernetes-monitoring/kubernetes-mixin#667

The CPU modes idle, iowait, steal should be excluded from the CPU utilization.

How to reproduce?

No response

Expected behavior

No response

Additional context

Per the iostat man page:

%idle
Show the percentage of time that the CPU or CPUs were idle and the
system did not have an outstanding disk I/O request.

%iowait
Show the percentage of time that the CPU or CPUs were idle during
which the system had an outstanding disk I/O request.

%steal
Show the percentage of time spent in involuntary wait by the
virtual CPU or CPUs while the hypervisor was servicing another
virtual processor.

[uhthomas]

I've updated #81 to fix this also.

[dotdc]

🎉 This issue has been resolved in version 1.1.0 🎉

The release is available on GitHub release

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