title: Can the "--skip-client" entity parameter be applied to only some entities?
body: <p>Using Jhipster 7.0.1, I'd like to generate entities where only a select few have their client-side-code generated. Generation without the client-side works as expected at first, but any subsequent entities with a frontend will force <em>all</em> entities to have a their client-side code generated.</p>
  <hr />
  <p><strong>To replicate the issue:</strong></p>
  <ul>
  <li>Generate an entity without a frontend. This correctly creates <strong>only</strong> server-sided code. <code>jhipster entity Foo --skip-client</code></li>
  <li>Generate an entity normally. <code>jhipster entity Bar</code></li>
  </ul>
  <p>*<em>For the test, entities were not created with any relationships.</em></p>
  <p>After generation, both <code>Foo</code>, and <code>Bar</code> will have client-side code generated. The log entry seems to highlight the issue:</p>
  <blockquote>
  <p>Found the .jhipster\Foo.json configuration file, entity can be automatically generated!</p>
  </blockquote>
  <hr />
  <p>When client-side only entities are created, its seems that there's no configuration saved in the <code>.jhipster\Foo.json</code> files to accommodate the <code>--skip-client</code> parameter. I could simply delete the json files of server-side only entities and thier corresponding entries in <code>.yo-rc.json</code>, but I'm concerned I'll run into issues upgrading Jhipster if they've been removed. Is there a better way I can accomplish this?</p>
  <hr />
  <p><strong>Edit:</strong>
  I may have found a solution. Adding both <code>&quot;skipClient&quot;</code> &amp; <code>&quot;skipServer&quot;</code> entries to every .jhipster/*.json file seems to resolve the issue.</p>
  <p><strong>.jhipster\Foo.json</strong></p>
  <pre><code>{
    &quot;name&quot;: &quot;Foo&quot;,
    &quot;skipClient&quot;: true,
    &quot;skipServer&quot;: false
  }
  </code></pre>
  <p>I believe this may be a bug where Jhipster is not adding the configuration on its own.</p>