Consider --port option for jpi server.

[ryotarai]

• Consider --port option for jpi server.
• When --httpPort is specified in JENKINS_OPTS, --port option is ignored.

$ jpi server --port=8081
...
INFO: HTTP Listener started: port=8081
...

$ JENKINS_OPTS="--httpPort=8082" jpi server
...
INFO: HTTP Listener started: port=8082
...

$ JENKINS_OPTS="--httpPort=8082" jpi server --port=8081
...
INFO: HTTP Listener started: port=8082
...

[buildhive]

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