Revert "Fix for the SDS update failure (envoyproxy#615)"

This reverts commit 0e0f25d.

Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com>

pkg/server/delta/v3/server.go

@@ -119,26 +119,8 @@ func (s *server) processDelta(str stream.DeltaStream, reqCh <-chan *discovery.De
 
 			watch := watches.deltaWatches[typ]
 			watch.nonce = nonce
-			// As per XDS protocol, for the non wildcard resources, management server should only respond to the resources
-			// requested by the client. Since we were replacing (instead of updating) the complete state resource version
-			// map after responding to the client, it was overriding/removing the resources subscribed by the client intermittently.
-			// As a result, the update of the such resources was never sent to the client.
-			// In order to address the issue, started updating the resources hash in the existing map instead of replacing
-			// the completed map.
-			// In case of wildcard resources, client never subscribes for the resources, replacing the state resource version based
-			// on the response by the management server is not an issue. Hence, the fix is only applicable for the non wildcard resources.
-			if !watch.state.IsWildcard() {
-				for k, hash := range resp.GetNextVersionMap() {
-					if currHash, found := watch.state.GetResourceVersions()[k]; found {
-						if currHash != hash {
-							watch.state.GetResourceVersions()[k] = hash
-						}
-					}
-				}
-			} else {
-				watch.state.SetResourceVersions(resp.GetNextVersionMap())
-			}
 
+			watch.state.SetResourceVersions(resp.GetNextVersionMap())
 			watches.deltaWatches[typ] = watch
 		case req, more := <-reqCh:
 			// input stream ended or errored out