[Deepspeed] match the trainer log level 
This PR sets the trainer log level for Deepspeed, so the whole application runs on the same log level.

Once https://github.com/microsoft/DeepSpeed/pull/1190 is merged running the trainer with `--log_level error --log_level_replica error` with deepspeed is absolutely silent, just gives you the training results.

well, minus the lame `tensorflow` info logs who refuses to be respectful of the ecosphere.

and pt-1.9.0's distributed + launch which too has the default log level wrong, but it will be fixed in 1.9.1

@sgugger 