Advertise SINGLE_NODE_MULTI_WRITER capability

[chrishenzie]

What type of PR is this?
/kind feature

What this PR does / why we need it:
This PR allows the mock driver to advertise the SINGLE_NODE_MULTI_WRITER capability and accept the SINGLE_NODE_SINGLE_WRITER and SINGLE_NODE_MULTI_WRITER access modes.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

avoid test failures when a CSI driver advertises the  SINGLE_NODE_MULTI_WRITER capability from CSI 1.5

/assign @msau42
/assign @jingxu97

[chrishenzie]

This PR is ready for review now that the CSI spec has been released.

[xing-yang]

Can you remove the special notes as you don't need that now? I don't think this needs a release note. Can you remove it?

[chrishenzie]

@xing-yang Done

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[msau42]

I believe we're moving away from mock driver and using hostpath driver instead.

[pohly]

The deprecation was announced in https://github.com/kubernetes-csi/csi-test/releases/tag/v4.2.0

We don't have a regular release schedule for csi-test. Shall I remove the source code from master now and then do a 5.0.0 immediately or wait, say, half a year (= October)?

I'm undecided about the version. The remaining code is mostly unchanged compared to 4.2.0.