title: jhipster: add @ElementCollection to existing entity
body: <p>I'm trying to use @ElementCollection manually because it's not mentioned in relationships section in jhipster documentation. I've changed java class,  tried to generate liquibase file with changes through <strong>mvn liquibase:diff</strong> and then included a relationship in the my entity.json</p>
  
  <pre><code> "relationships": [
  
          {
              "relationshipId": 1,
              "relationshipName": "contato_telefone",
              "otherEntityName": "telefone",
              "relationshipType": "one-to-many",
              "otherEntityField": "telefone",
              "ownerSide": true
          }
  </code></pre>
  
  <p>entity class</p>
  
  <pre><code> @ElementCollection
      @CollectionTable(name = "contato_telefone", joinColumns = @JoinColumn(name = "id_contato"))
      @Column(name = "telefone")
      private List&lt;String&gt; telefone;
  </code></pre>
  
  <p>When I tried to run app I got a LazyInitiationException and relationship table <strong>contato_telefone</strong> was not created. Am I missing something? What I need to do to solve this?</p>