Turn manage-volumes into a daemon

- Only create volumes if they are requested via ldap, for example
  as info:use_volume=home

- If a project doesn't request a volume but the volume exists,
  disable access to that volume

- Log volumes that exist but aren't requested, volumes that belong
  to instanceless projects, and volumes that no longer have a
  project at all.

- Fix a bug that was causing us to reset access permissions
  on every run even when nothing had changed.

- Track volumes that need stopping and then actually stop them
  after an hour if nothing has happened in the meantime.

Change-Id: If3b639726a667b4d70f59a1b3ec49a80961d1478
Merge "Turn manage-volumes into a daemon" into production