Module ''ceph_add_users_buckets.py" is not idempotent - Simple update could fix it

[wissemmimouna]

The module lack idempotency as it's important for ansible , it simply need not to consider existing users/buckets as error .
To do that simply do not raise module.fail_json and instead put change false to the result dict in the main function:

     # conditional state caused a failure
     if result['added_users'] == '' and result['added_buckets'] == '':                                                                 
        #module.fail_json(msg='No users or buckets were added successfully' , **result)
         result['changed'] = False
     # EXIT
    module.exit_json(**result)
 
 if __name__ == '__main__':
     main()