MultiNetwork Policy should be namespaced

[sferlin]

According to the following:

oc api-resources --api-group='k8s.cni.cncf.io'
NAME                             SHORTNAMES       APIVERSION                 NAMESPACED   KIND
ipamclaims                                        k8s.cni.cncf.io/v1alpha1   true         IPAMClaim
multi-networkpolicies            multi-policy     k8s.cni.cncf.io/v1beta1    true         MultiNetworkPolicy
network-attachment-definitions   net-attach-def   k8s.cni.cncf.io/v1         true         NetworkAttachmentDefinition

The https://github.com/openshift-kni/telco-reference/blob/main/telco-core/configuration/reference-crs-kube-compare/required/networking/multinetworkpolicy/multiNetworkPolicyAllowPortProtocol.yaml#L5 should include a wildcard for a namespace:

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: allow-port-and-protocol
  {{- if .metadata }}
  namespace: {{ .metadata.namespace }}
  {{- end }}

The documentation suggests the namespace to be present for its CLI version: https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/networking/multiple-networks#nw-networkpolicy-create-cli_configuring-multi-network-policy