Adaptations due to Vaadin 8 merge

Signed-off-by: Ammar Bikic <ammar.bikic@bosch.io>

hawkbit-repository/hawkbit-repository-core/src/main/java/org/eclipse/hawkbit/repository/builder/AbstractBaseEntityBuilder.java

@@ -8,11 +8,15 @@
  */
 package org.eclipse.hawkbit.repository.builder;
 
-public abstract class AbstractBaseEntityBuilder {
+import org.eclipse.hawkbit.repository.Identifiable;
+
+public abstract class AbstractBaseEntityBuilder implements Identifiable<Long> {
 
     protected Long id;
 
+    @Override
     public Long getId() {
         return id;
     }
+
 }