traffic_ctl - Remove legacy/pretty format output options. #9471
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TL;DR;
pretty|legacyaren't really needed anymore(or ever for what is worth).They were introduced to help with the migration from the old mgmt api to the jsonrpc, the idea was to keep the legacy output messages as well as new ones if needed. This was never used, legacy and pretty can both live together without the need to have them separated.
If something this was only adding complexity.
This is a cleanup, no new feature and it does not break anything.