/checkPermissions - not returning 401 for non-existent user in cb server

1. Create a user in LDAP and enable authentication in CB.
2. Assign a role to the user in CB
3. Remove the user from all roles in CB and execute the following:
   curl -X POST --data ‘cluster.pools!read,cluster.nodes!read’ http://dave:password@10.142.150.101:8091/pools/default/checkPermissions

Expected Result - Since the user is not part of CB anymore and the user credentials are passed in curl, it should return a 401.