Check all Group Members against ClassList to re-sync on Cron

[ymdahi]

• Cron task
• $Members: Get list of all members in a Group https://drupal.stackexchange.com/questions/298400/get-user-ids-of-group-members
• $ClassList: Get LMS ClassList using OU
• For each Member, lookup user to see if they are in ClassList
  • If they are in ClassList, check if there Role needs to change
  • Log the change of Role if occurs
• If they are not in ClassList, remove them from Group
  • Log the removal of the member

Consider: maybe it makes sense to remove the Membership from all occurance of Group using OU value.