remove kube-apiserver --storage-version flag

[hzxuzhonghu]

#--storage-version has been deprecated more than a year ago, should remove it.

Release note:

Remove kube-apiserver `--storage-version` flag, use `--storage-versions` instead.

[hzxuzhonghu]

/assign @sttts

[sttts]

Release notes need to mention the replacement flag.

[hzxuzhonghu]

done

[sttts]

/lgtm
/approve

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This pull-request has been approved by: hzxuzhonghu, sttts

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@hzxuzhonghu: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-e2e-gce	9789f24	link	/test pull-kubernetes-e2e-gce

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