Performance optimizations for Multi-Assignments (#858)

* Add remote event test for the new MultiActionEvent
* Improve test descriptions
* Improve sendMultiActionRequestMessages
* Moved action filtering to the database query level (#12)
* Use @ExpectedEvents instead of EventHandlerStubs
* Removed @Param from 'existsByTargetControllerIdAndStatusAndActiveIsTrue'
* Reverted metadata initialization
* Fix hawkBit bot findings

Signed-off-by: Stefan Behl <stefan.behl@bosch-si.com>
Signed-off-by: Ahmed Sayed <ahmed.sayed@bosch-si.com>

hawkbit-dmf/hawkbit-dmf-api/src/main/java/org/eclipse/hawkbit/dmf/json/model/DmfMetadata.java

@@ -79,4 +79,8 @@ public class DmfMetadata {
         return true;
     }
 
+    @Override
+    public String toString() {
+        return String.format("DmfMetadata [key='%s', value='%s']", key, value);
+    }
 }

hawkbit-dmf/hawkbit-dmf-api/src/main/java/org/eclipse/hawkbit/dmf/json/model/DmfSoftwareModule.java

@@ -83,4 +83,11 @@ public class DmfSoftwareModule {
         }
     }
 
+    @Override
+    public String toString() {
+        return String.format(
+                "DmfSoftwareModule [moduleId=%d, moduleType='%s', moduleVersion='%s', artifacts=%s, metadata=%s]",
+                moduleId, moduleType, moduleVersion, artifacts, metadata);
+    }
+
 }