CASSANDRA-17445 switch management framework from airline to picocli

[Mmuzaf]

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The Cassandra Jira

[Mmuzaf]

[maedhroz]

@Mmuzaf btw, the title here mentions airline-2, but we're actually going to picocli, right?

[Mmuzaf]

@Mmuzaf btw, the title here mentions airline-2, but we're actually going to picocli, right?

@maedhroz Correct, I've updated the title.
Airline-2 doesn't work well for us because it doesn't allow the jmx options to be separated from the commands (don't want to include jmx options in the command hierarchy as they are related to the nodetool only).

[smiklosovic]

I would rename this to AbstractCommand

[smiklosovic]

why protected when we have setter / getter?