nrt: log: return updated generation value for cache

The logs show misaligned generation value when tackling the same node in
overreserve.go and filter.go logs where the former is always up to date
while the latter is never updated (generation=0):

```
1 overreserve.go:310] "NodeTopology podset fingerprint mismatch" logger="nrtcache.resync" generation=3 node="node-1"
...
1 filter.go:202] "invalid topology data" logger="FilterWithNominatedPods.Filter.NodeResourceTopologyMatch" pod="default/test-6f798bf799-tj7bc" pod="default/test-6f798bf799-tj7bc" podUID="f221ce7c-09c9-4462-a67a-95f5fdec3fb7" node="node-1" generation=0
```

The only cache implementation that defines and uses "generation" is
OverReserve thus this commit updates the method GetCachedNRTCopy() to return updated
generation value in the returned CachedNRTInfo.

Signed-off-by: Shereen Haj <[email protected]>

Author: shajmakh

pkg/noderesourcetopology/cache/overreserve.go

@@ -101,17 +101,16 @@ func NewOverReserve(ctx context.Context, lh logr.Logger, cfg *apiconfig.NodeReso
 func (ov *OverReserve) GetCachedNRTCopy(ctx context.Context, nodeName string, pod *corev1.Pod) (*topologyv1alpha2.NodeResourceTopology, CachedNRTInfo) {
 	ov.lock.Lock()
 	defer ov.lock.Unlock()
+	info := CachedNRTInfo{Generation: ov.generation}
 	if ov.nodesWithForeignPods.IsSet(nodeName) {
-		return nil, CachedNRTInfo{}
+		return nil, info
 	}
 
-	info := CachedNRTInfo{Fresh: true}
+	info.Fresh = true
 	nrt := ov.nrts.GetNRTCopyByNodeName(nodeName)
 	if nrt == nil {
 		return nil, info
 	}
-
-	info.Generation = ov.generation
 	nodeAssumedResources, ok := ov.assumedResources[nodeName]
 	if !ok {
 		return nrt, info