[jvm-packages] delete all constraints from spark layer about obj and eval metrics and handle error in jvm layer (#4560)
* temp * prediction part * remove supported* * add for test * fix param name * add rabit * update rabit * return value of rabit init * eliminate compilation warnings * update rabit * shutdown * update rabit again * check sparkcontext shutdown * fix logic * sleep * fix tests * test with relaxed threshold * create new thread each time * stop for job quitting * udpate rabit * update rabit * update rabit * update git modules
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