#814 Added hook_update_N() to remove unused OSR staff and testing accounts.

[proofoftom]

Also, changes the behavior of how users are added. Instead of adding CU users automatically, we now assign them the appropriate role if added later.

[alexfinnarn]

Not sure on the change Tommy added to cu_users_get_users(). Maybe should go in another function since it's not returning a user.

  // If a account name was provided then return the user's role name to
  // cu_users_get_user_role().
  if ($type === NULL && $account_name) {
    foreach ($user_array as $role_name => $users) {
      if (in_array($account_name, array_keys($users))) {
        return $role_name;
      }
    }
  }

[kreynen]

Rather than remove in a single update hook, the removal needs to be ongoing. This is now being handled in #814