[jvm-packages] add hostIp and python exec for rabit tracker #7808
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To close #7700.
This PR add cusomized rabit tracker host IP and the python exec,
user needs to add tracker_conf parameter like
"tracker_conf" -> TrackerConf(0L, "python", "192.168.22.111", "/usr/bin/python3)
Please note that, both he hostIp and pythonExec are optional