Refactor wait_for_{pods, pvcs, pvc} and {pods, pvcs, pvs} files

[wojtek-t]

We're accumulating a lot of code duplication for different types:

• pods: https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/util/pods.go https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/common/wait_for_pods.go
• pvcs https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/util/pvcs.go https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/common/wait_for_pvcs.go
• pvs https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/util/pvs.go https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/pkg/measurement/common/wait_for_pvs.go

Those should be refactor to share as much code as possible

[wojtek-t]

How I would see that:

• the files from /util directory should implement some interfaces (Diff, ComputeStatus, etc.)
• the wait_for-* should simply take the interface and use that (this one should hopefully be possible to implement just once and not even have any customizations for)

[wojtek-t]

@krzysied - FYI

[fejta-bot]

Issues go stale after 90d of inactivity. Mark the issue as fresh with /remove-lifecycle stale. Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

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

[wojtek-t]

/remove-lifecycle stale /lifecycle frozen