Management API: Expose forceTime and startAt fields in rollout representation (#1336)

* Expose forceTime and startAt fields in rollout representation in Mgmt API
* Change "forceTime" to "forcetime"
* Add checks when making a POST request in the tests
* Change forced to timeforced in tests and extend validity check
* Pass aforcetime and startat arguments as test checks
* remove unused import

Signed-off-by: Stanislav Trailov <stanislav.trailov@bosch.io>

hawkbit-rest/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/rollout/MgmtRolloutResponseBody.java

@@ -44,6 +44,12 @@ public class MgmtRolloutResponseBody extends MgmtNamedEntity {
     @JsonProperty
     private Integer totalGroups;
 
+    @JsonProperty
+    private Long startAt;
+
+    @JsonProperty
+    private Long forcetime;
+
     @JsonProperty
     private boolean deleted;
 
@@ -101,6 +107,22 @@ public class MgmtRolloutResponseBody extends MgmtNamedEntity {
         return totalTargets;
     }
 
+    public void setStartAt(final Long startAt) {
+        this.startAt = startAt;
+    }
+
+    public Long getStartAt() {
+        return startAt;
+    }
+
+    public void setForcetime(final Long forcetime) {
+        this.forcetime = forcetime;
+    }
+
+    public Long getForcetime() {
+        return forcetime;
+    }
+
     public Map<String, Long> getTotalTargetsPerStatus() {
         return totalTargetsPerStatus;
     }