DS #4993 #662 : autotune single node hostfile bugfix (#4996)
Test result in single node
Co-authored-by: John-Saxon <zhang.xiangxuan@oushu.com>
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Michael Wyatt <michaelwyatt@microsoft.com>
