title: Property to prevent gitlab from protecting default branches
body: <p>With version 7.4 gitlab changed the behaviour of protected branches in new projects.</p>
  
  <p>In every new project the default branch e.g. master is a protected branch, meaning developers are not able to push to it. In my company a lot of developers work on the default/master branch and are now struggeling when starting a new project.</p>
  
  <p>My Question: Is there a property in the ui or in the <code>gitlab.rb</code> to restore the pre 7.4 behaviour and to not protect the default branch?</p>