Ceph » Orchestrator

Looking into the docs [1], I see that we can use the `add` command in two different ways:

1) ceph orch daemon add iscsi -i <json_file>

2) ceph orch daemon add iscsi <pool>

but apparently the first one is not working as expected:

node1:~ # ceph orch daemon add iscsi -i iscsi.yaml 
Invalid command: missing required parameter pool(<string>)
orch daemon add iscsi <pool> [<fqdn_enabled>] [<trusted_ip_list>] [<placement>] :  Start iscsi daemon(s)
Error EINVAL: invalid command

node1:~ # ceph orch daemon add iscsi rbd -i iscsi.yaml 
Error EINVAL: Failed to read JSON input: Expecting value: line 1 column 1 (char 0)
        Usage:
          ceph orch daemon add iscsi -i <json_file>
          ceph orch daemon add iscsi <pool>

We should fix the command, or the documentation if it's not supposed to use the `-i` option.

[1] https://github.com/ceph/ceph/blob/master/src/pybind/mgr/orchestrator/module.py#L738