Rename kubectl hns command 'create2' to 'create'

[yiqigao217]

Part of #457.
Tested on the GKE cluster.

[adrianludwin]

/approve
/lgtm

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[yiqigao217]

/approve
/lgtm

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[adrianludwin]

/approve
/lgtm

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[yiqigao217]

/retest

The failed tests are the flaky tests mentioned in #571 .

[yiqigao217]

/check-cla

[yiqigao217]

/label size/S

[k8s-ci-robot]

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