Use Empty defined in the context to prevent duplication

proto/l3_centralizedattackdetector.proto

@@ -18,13 +18,13 @@ import "context.proto";
 
 service L3Centralizedattackdetector {
   // Analyze single input to the ML model in the CAD component
-  rpc AnalyzeConnectionStatistics (L3CentralizedattackdetectorMetrics) returns (Empty) {}
+  rpc AnalyzeConnectionStatistics (L3CentralizedattackdetectorMetrics) returns (context.Empty) {}
 
   // Analyze a batch of inputs to the ML model in the CAD component
-  rpc AnalyzeBatchConnectionStatistics (L3CentralizedattackdetectorBatchInput) returns (Empty) {}
+  rpc AnalyzeBatchConnectionStatistics (L3CentralizedattackdetectorBatchInput) returns (context.Empty) {}
 
   // Get the list of features used by the ML model in the CAD component
-  rpc GetFeaturesIds (Empty) returns (AutoFeatures) {}
+  rpc GetFeaturesIds (context.Empty) returns (AutoFeatures) {}
 }
 
 message Feature {
@@ -63,6 +63,6 @@ message L3CentralizedattackdetectorBatchInput {
 	repeated L3CentralizedattackdetectorMetrics metrics = 1;
 }
 
-message Empty {
-	string message = 1;
-}
+// message Empty {
+// 	string message = 1;
+// }