Thanks @chetanmeh, However it doesn't appear that `ScallopOption[List[String]]` 
has a `toSet` method whic was the reason for the explicit conversion. Am I 
missing something?
```> Task :tools:admin:compileScala
/openwhisk/tools/admin/src/main/scala/whisk/core/database/LimitsCommand.scala:82:
 value toSet is not a member of org.rogach.scallop.ScallopOption[List[String]]
          allowedKinds.toSet))
                       ^
one error found

> Task :tools:admin:compileScala FAILED
```

[ Full content available at: 
https://github.com/apache/incubator-openwhisk/pull/4035 ]
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