fix race condition in exp manager
jenkins jenkins jenkins jenkins jenkins jenkins jenkins jenkins This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days. This PR was closed because it has been inactive for 7 days since being marked as stale.
# What does this PR do ?

in exp manager we move files on rank0, but this move is not always completed by the time the other ranks go and do other things such as try to run `ls` on the file system. So this adds a sync to make sure
