IMP-1118: Remove incorrect const on ThreadPool::AssignToCgroup
IMP-1118: Remove incorrect const on ThreadPool::AssignToCgroup

Change-Id: I51e66abfb5861efaf455991234be363564e99a10
Reviewed-on: http://gerrit.ent.cloudera.com:8080/827
Reviewed-by: Lenni Kuff <724b7df200764f5dc1b723c05ee6c6adabd11bb1@cloudera.com>
Tested-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>

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