This option is an alternative to --port|-p and takes precedence over it.
This is meant to aid the switch from the legacy nodetool to the native
one. Users of the legacy nodetool pass the port of JMX to --port. We
need a way to provide both the JMX port (via --port) and also the REST
API port, which only the native nodetool will interpret. So we add this
new --rest-api-port, which when provided, overwrites the --port|-p
option. To ensure the legacy nodeotol doesn't try to interpret this,
this option can also be provided as -Dcom.scylladb.apiPort (which is
substituted to --rest-api-port behind the scenes).
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