Update sig-storage features as implemented

[msau42]

Fixes: #557

[msau42]

/assign @xing-yang

[xing-yang]

It looks that verify failed because "sig-pm" mentioned in the following kep no longer exists?

https://github.com/kubernetes/enhancements/blob/master/keps/0001-kubernetes-enhancement-proposal-process.md

../../keps/0001-kubernetes-enhancement-proposal-process.md has an error: "error validating KEP metadata: "owning-sig" must be one of (committee-code-of-conduct,committee-product-security,committee-steering,sig-api-machinery,sig-apps,sig-architecture,sig-auth,sig-autoscaling,sig-cli,sig-cloud-provider,sig-cluster-lifecycle,sig-contributor-experience,sig-docs,sig-instrumentation,sig-multicluster,sig-network,sig-node,sig-release,sig-scalability,sig-scheduling,sig-service-catalog,sig-storage,sig-testing,sig-ui,sig-usability,sig-windows,ug-big-data,ug-vmware-users,wg-api-expression,wg-component-standard,wg-data-protection,wg-iot-edge,wg-k8s-infra,wg-lts,wg-machine-learning,wg-multitenancy,wg-policy,wg-security-audit) but it is a string: sig-pm"

[palnabarun]

SIG PM has been retired vide kubernetes/community#4722

@justaugustus need your help here 🙂

/cc @justaugustus

[justaugustus]

@palnabarun -- thanks for the heads up. Will take a look tomorrow!

[spiffxp]

/retest
#1699 merged, should fix

[xing-yang]

/lgtm
/approve

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