Fixed wring metadata change in RSQL test

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/DistributionSetManagement.java

@@ -762,7 +762,7 @@ public class DistributionSetManagement {
         if (distributionSetMetadataRepository.exists(metadata.getId())) {
             throwMetadataKeyAlreadyExists(metadata.getId().getKey());
         }
-        // merge base software module so optLockRevision gets updated and audit
+        // merge base distribution set so optLockRevision gets updated and audit
         // log written because
         // modifying metadata is modifying the base distribution set itself for
         // auditing purposes.

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/model/DistributionSet.java

@@ -140,7 +140,7 @@ public class DistributionSet extends NamedVersionedEntity {
     }
 
     public List<DistributionSetMetadata> getMetadata() {
-        return metadata;
+        return Collections.unmodifiableList(metadata);
     }
 
     public List<Action> getActions() {
@@ -171,10 +171,6 @@ public class DistributionSet extends NamedVersionedEntity {
         return requiredMigrationStep;
     }
 
-    /**
-     * @param deleted
-     *            the deleted to set
-     */
     public DistributionSet setDeleted(final boolean deleted) {
         this.deleted = deleted;
         return this;
@@ -185,10 +181,6 @@ public class DistributionSet extends NamedVersionedEntity {
         return this;
     }
 
-    /**
-     * @param tags
-     *            the tags to set
-     */
     public DistributionSet setTags(final Set<DistributionSetTag> tags) {
         this.tags = tags;
         return this;

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/model/SoftwareModule.java

@@ -221,7 +221,7 @@ public class SoftwareModule extends NamedVersionedEntity {
     }
 
     public List<SoftwareModuleMetadata> getMetadata() {
-        return metadata;
+        return Collections.unmodifiableList(metadata);
     }
 
     @Override