Release 2.2 backport

[pohly]

What type of PR is this?
/kind bug

What this PR does / why we need it:

Two bug fixes that should go into 2.2.1.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

- gathered metric family process_start_time_seconds has help "[ALPHA] Start time of the process since unix epoch in seconds." but should have "Start time of the process since unix epoch in seconds."
- Fix capacity information updates when topology changes. Only affected central deployment and network attached storage, not deployment on each node. This broke in v2.2.0 as part of a bug fix for capacity informer handling.

[xing-yang]

Are you backporting to 2.2.1? Why does it say merging into kubernetes-csi:master?

[pohly]

Are you backporting to 2.2.1? Why does it say merging into kubernetes-csi:master?

My bad. I fixed the target base, now it is against release-2.2 as intended.

[pohly]

The alternative to this PR is to add a 2.2.1 changelog entry on master, tag there, and fast-forward release-2.2.

[k8s-ci-robot]

@pohly: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kubernetes-csi-external-provisioner-1-21-on-kubernetes-1-21	bddcf41	link	/test pull-kubernetes-csi-external-provisioner-1-21-on-kubernetes-1-21

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[msau42]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, pohly

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