autotp training(fix dco) (#7004)
Same as [this PR](https://github.com/deepspeedai/DeepSpeed/pull/6922).
[affeb88](https://github.com/deepspeedai/DeepSpeed/pull/6922/commits/affeb884576936b3a0efc5ce86435da37db1d87e)
I noticed the CI updated the DCO check recently. Using the suggested
rebase method for sign-off would reintroduce many conflicts, so I opted
for a squash merge with sign-off instead. thanks: )
Signed-off-by: inkcherry <mingzhi.liu@intel.com>
