title: Master\owner can't edit or delete tags on gitlab repository
body: <p>I'm trying to delete the tag with specific user by</p>
  
  <pre><code>    git push --delete origin deleteme
  </code></pre>
  
  <p>I'm authorized by ssh key with user that belongs to admin group and have "Owner" permissions to the repository. I'm getting the following error:</p>
  
  <pre><code>    remote: GitLab: You are not allowed to change existing tags on this project.
  </code></pre>
  
  <p>If I create a new user with the same permissions, I am able to delete tags successfully. I tried to revoke and grant ownership again but nothing changed. Logs say nothing. The only difference between this user and the new one is that naughty user does not use LDAP.
  Tags on the project are not protected.</p>
  
  <p>Has anyone faced the same issue? </p>