Allow guests to register their devices

• Type: Technical Task
• Status: Closed
• Resolution: Fixed
• Affects Version/s: None
• Fix Version/s: 6.2.X EE, 7.0.0 M1
• Component/s: Push Notifications
• Labels: None
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins/pull/3523

There will be some cases in which we won't require users to authenticate before registering their devices for push notifications.