Streamline security setup flow

* The setup flow is changed such that the user is asked to activate
  device administration before leaving the setup flow, rather than
  having to wait for the notification to appear, etc.
* Accounts requiring security are created in a security hold state
  to prevent initial sync until device administration is active

Change-Id: I7e33cf98466370ae27414b99018f7aee71e9e237
3 files changed