OCM-6501 | fix: Adjust describe machine pool output

[oriAdler]

Change to additional security groups ids to match the flag name.

e.g.

oadler@fedora:rosa (OCM-6501)$ rosa describe machinepool -c croche worker

ID:                                    worker
Cluster ID:                            2ai5ok6qebvc8jk442pnsoci2ob00fmn
Autoscaling:                           No
Replicas:                              2
Instance type:                         m5.xlarge
Labels:                                
Taints:                                
Availability zones:                    eu-west-1a
Subnets:                               
Spot instances:                        No
Disk size:                             300 GiB
Additional Security Group IDs:         123

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.69%. Comparing base (3159d23) to head (6455328).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1927   +/-   ##
=======================================
  Coverage   21.69%   21.69%           
=======================================
  Files         118      118           
  Lines       19797    19797           
=======================================
  Hits         4294     4294           
  Misses      15181    15181           
  Partials      322      322           

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[robpblake]

/lgtm

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