Introduce action status scoped custom code (#1277)

* Allow providing a custom code with an action status feedback to give more fine grained device specific details.
* Add ddi rest docs for new optional status code value.
* Provide new code value via mgmt api. Fix review findings.
* Fix failing tests

Signed-off-by: Michael Herdt <Michael.Herdt@bosch.io>
Co-authored-by: Stefan Behl <stefan.behl@bosch.io>

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

@@ -12,7 +12,9 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
@@ -31,6 +33,9 @@ public class DmfActionUpdateStatus {
     @JsonProperty
     private Long softwareModuleId;
 
+    @JsonProperty
+    private Integer code;
+
     @JsonProperty
     private List<String> message;
 
@@ -56,6 +61,15 @@ public class DmfActionUpdateStatus {
         return actionStatus;
     }
 
+    @JsonIgnore
+    public Optional<Integer> getCode() {
+        return Optional.ofNullable(code);
+    }
+
+    public void setCode(final Integer code) {
+        this.code = code;
+    }
+
     public List<String> getMessage() {
         if (message == null) {
             return Collections.emptyList();