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Merge pull request #385 from jehiah/empty_fin_385

nsqd: invalid FIN causes panic
expose Auth data in nsqadmin and client remote address
Merge pull request #386 from jehiah/nsqadmin_auth_data_386

nsqadmin: display connection auth state, and remote address
nsqlookupd: deflake TestTombstoneRecover
nsqlookupd: deflake TestInactiveNodes
nsqd: deflake TestSampling
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