Fix tests to reflect newAPI changes

[tssurya]

We fixed the peer API to be symmetric to the subject API via #196

Let's change this to also reflect on the test cases.

So change:

- namespaces:
        namespaceSelector:
          matchLabels:

to

- namespaces:
          matchLabels:

in peers everywhere

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[tssurya]

I am testing this on ovnk once I make the related changes there. hold.

[tssurya]

ran this against: ovn-kubernetes/ovn-kubernetes#4245 which consumes the new syntax for namespace peers and its working.

PASS
ok      sigs.k8s.io/network-policy-api/conformance      376.320s

looks fine; let's merge

[astoycos]

/lgtm
/approve

Thanks @tssurya!!!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astoycos, tssurya

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