Return existing reservation if podRef matches

[xagent003]

k8snetworkplumbingwg#291

Was able to verify fix works, tried same upgrade scenario. I see an ADD coming in, full IP pool. It returns the existing reservation:

2023-01-13T00:30:34.593Z	DEBUG	PF9: Current Allocations: [IP: 10.128.165.32 is reserved for pod: default/asdasd-0 IP: 10.128.165.33 is reserved for pod: default/asdasd-1 IP: 10.128.165.34 is reserved for pod: default/asdasd-2]
2023-01-13T00:30:34.593Z	DEBUG	IterateForAssignment input >> ip: 10.128.165.32 | ipnet: {10.128.165.0 ffffff00} | first IP: 10.128.165.32 | last IP: 10.128.165.34
2023-01-13T00:30:34.593Z	DEBUG	Found existing reservation 10.128.165.33 with matching podRef default/asdasd-1
2023-01-13T00:30:34.593Z	DEBUG	Reserving IP: |10.128.165.33 4374da0039f84c87613d7c53823923b1682b5714fbe31253a8e1516d111cc383|
2023-01-13T00:30:34.593Z	DEBUG	OverlappingRangewide allocation check for IP: 10.128.165.33
2023-01-13T00:30:34.607Z	DEBUG	IP 10.128.165.33 matches existing podRef default/asdasd-1
2023-01-13T00:30:34.607Z	DEBUG	PF9: updatedreservelist: [IP: 10.128.165.32 is reserved for pod: default/asdasd-0 IP: 10.128.165.33 is reserved for pod: default/asdasd-1 IP: 10.128.165.34 is reserved for pod: default/asdasd-2 IP: 10.128.165.33 is reserved for pod: default/asdasd-1]
2023-01-13T00:30:34.607Z	DEBUG	PF9: patch = [{replace /spec/allocations/33/id 4374da0039f84c87613d7c53823923b1682b5714fbe31253a8e1516d111cc383}]
2023-01-13T00:30:34.609Z	DEBUG	PF9: wrote patchdata: [{"op":"test","path":"/metadata/resourceVersion","value":"11983"},{"op":"replace","path":"/spec/allocations/33/id","value":"4374da0039f84c87613d7c53823923b1682b5714fbe31253a8e1516d111cc383"}]
2023-01-13T00:30:34.609Z	DEBUG	PF9: New reservelist: [IP: 10.128.165.32 is reserved for pod: default/asdasd-0 IP: 10.128.165.33 is reserved for pod: default/asdasd-1 IP: 10.128.165.34 is reserved for pod: default/asdasd-2 IP: 10.128.165.33 is reserved for pod: default/asdasd-1]
2023-01-13T00:30:34.612Z	DEBUG	clusteripres already exists, updating with {4374da0039f84c87613d7c53823923b1682b5714fbe31253a8e1516d111cc383 default/asdasd-1}
2023-01-13T00:30:34.614Z	DEBUG	K8s UpdateOverlappingRangeAllocation success on allocate: &{TypeMeta:{Kind: APIVersion:} ObjectMeta:{Name:10.128.165.33 GenerateName: Namespace:default SelfLink: UID: ResourceVersion: Generation:0 CreationTimestamp:0001-01-01 00:00:00 +0000 UTC DeletionTimestamp:<nil> DeletionGracePeriodSeconds:<nil> Labels:map[] Annotations:map[] OwnerReferences:[] Finalizers:[] ClusterName: ManagedFields:[]} Spec:{ContainerID:4374da0039f84c87613d7c53823923b1682b5714fbe31253a8e1516d111cc383 PodRef:default/asdasd-1}}