title: FOSUserBundle, password (plainPassword) are not encrypted on submit POST form
body: <p>In my Symfony project, I am using the <a href="https://github.com/FriendsOfSymfony/FOSUserBundle" rel="nofollow noreferrer">FOS</a> user bundle.</p>
  <p>In my secutity.yml I have this in order to use bcrypt encoder:</p>
  <pre><code>security:
      # FOS UserBundle needles
      encoders:
          Symfony\Component\Security\Core\User\User: bcrypt
          MyNamespace\MyBundle\Entity\User: bcrypt
          FOS\UserBundle\Model\UserInterface: bcrypt
  </code></pre>
  <p>I call the fos user registration form in an embeded form like this:</p>
  <pre><code>$builder
    -&gt;add('contactPhone')
    -&gt;add('contactMobilePhone')
    -&gt;add('user', 'fos_user_registration', array(
                                                 'label' =&gt; false,
        ))
  </code></pre>
  <p>It renders me this for example:
  <a href="https://i.stack.imgur.com/S5XsH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/S5XsH.png" alt="enter image description here" /></a></p>
  <p>But when I submit the form, I could see in the network console browser that my password are in plain text and everybody could use them.</p>
  <p>So I can recover all datas of my POST request in the console browser:</p>
  <blockquote>
  <p><code>my_form[user][email]=test@test.com</code></p>
  <p><code>my_form[contactPhone]=0404040404</code></p>
  <p><code>my_form[contactMobilePhone]=0606060606</code></p>
  <p><code>my_form[user][username]=test</code></p>
  <p><code>my_form[user][plainPassword][first]=test</code> // first password entry</p>
  <p><code>my_form[user][plainPassword][second]=test</code> // verification</p>
  <p><code>my_form[save]</code> // submit my_form[_token_consumer]=// no need to see him</p>
  </blockquote>
  <p>You could understand That iit's not secured. I need to encode the password when I submit the form in order to not allow everybody to see them.</p>
  <p>Note that the same thing occured when I log myself with the FOSUserBundle user login form.</p>