ClusterLoader: Combine provider specific code in a single place

[wojtek-t]

There are multiple measurements that introduce provider specific code, e.g.: https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/common/etcd_metrics.go#L95 https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/common/scheduler_latency.go#L178

Those should be extracted from measurements to a separate single location.

@shyamjvs

[fejta-bot]

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Send feedback to sig-testing, kubernetes/test-infra and/or fejta. /lifecycle stale

[wojtek-t]

/remove-lifecycle stale /lifecycle frozen

[wojtek-t]

This is being addressed as we speak: https://github.com/kubernetes/perf-tests/pull/1344