system ceph-mon-add operation unexpected not rejected on AIO-DX + N worker configuration. Results in ceph -s output not correlating with system ceph-mon-list output

[Wendy Mitchell]

On AIO-plus system with workers (AIO-DX+N) the user is unexpectedly allowed to run $system ceph-mon-add even though only one monitor is currently supported for AIO systems (ceph -s only lists 1)

Severity
--------
standard

Steps to Reproduce
------------------

1. Installed system with AIO configuration plus workers (eg. AIO controllers + 3 workers)
controller-0, controller-1 and compute-# are listed with ceph-mon-list

$system ceph-mon-list
$ system ceph-mon-add
usage: system ceph-mon-add <hostname or id>

[sysadmin@controller-0 ~(keystone_admin)]$ system ceph-mon-list
---------------------------------------------------------------------
uuid ceph_ hostname state task
   mon_g
   ib
---------------------------------------------------------------------
508ffb3e-4b89-4fa5-8b83-79269a7cd583 20 controller-0 configured None
79f591ae-7d7a-4fb6-9f5f-6860ea91975c 20 controller-1 configured None
cafe5769-bd96-47ac-b937-93d1b24aec35 20 compute-0 configured None

---------------------------------------------------------------------

Check corresponding ceph -s output
controller-0:~$ ceph -s
cluster:
id: 22abcab3-ee37-4ec7-a312-7739e725a145
health: HEALTH_OK

services:
mon: 1 daemons, quorum controller
mgr: controller-0(active), standbys: controller-1
osd: 2 osds: 2 up, 2 in

data:
pools: 1 pools, 64 pgs
objects: 0 objects, 0 B
usage: 215 MiB used, 892 GiB / 892 GiB avail
pgs: 64 active+clean

Expected Behavior
------------------
Currently adding a ceph-mon on AIO-plus system (AIO-DX+N) is not supported so expect the command should not have been allowed in this case.

Actual Behavior
----------------
The system ceph-mon-add operation was not rejected
The ceph -s output does not correlate with system ceph-mon-list output as a result

Reproducibility
---------------
yes

System Configuration
--------------------
AIO plus ie. AIO-DX controllers + N workers

Branch/Pull Time/Commit
-----------------------
Master as of 2020-02-11_00-10-00

Last Pass
---------
ceph -s appears to list the monitors on other configuration types

Timestamp/Logs
--------------
see inline

Test Activity
-------------
Regression

[Ghada Khalil (gkhalil)]

Not Gating - no negative system impact is noted

[Ramaswamy Subramanian (rsubrama)]

No progress on this bug for more than 2 years. Candidate for closure.

If there is no update, this issue is targeted to be closed as 'Won't Fix' in 2 weeks.

[Ramaswamy Subramanian (rsubrama)]

Changing the status to 'Won't Fix' as there is no activity.