Description of problem:
 
`oc adm upgrade` silently errors out on incorrect subcommand without doing/notifying anything
this is due to the `default` case in `run()` which catches all the incorrect subcommand and runs the default part instead. 


Version-Release number of selected component (if applicable): 4.10 and current


How reproducible:
use any incorrect subcommand with `oc adm upgrade`. 
example: `oc adm upgrade incorrect-subcommand`

Steps to Reproduce:
1. run `oc adm upgrade incorrect-subcommand`


Actual results:
oc prints the cluster upgrade status

Expected results:
oc should error out saying incorrect subcommand