Add stdout and stderr for PAI mode (#2563)

src/nni_manager/training_service/pai/paiK8S/paiK8SData.ts

@@ -33,4 +33,4 @@ export const PAI_K8S_TRIAL_COMMAND_FORMAT: string =
 `export NNI_PLATFORM=pai NNI_SYS_DIR={0} NNI_OUTPUT_DIR={1} NNI_TRIAL_JOB_ID={2} NNI_EXP_ID={3} NNI_TRIAL_SEQ_ID={4} MULTI_PHASE={5} \
 && NNI_CODE_DIR={6} && mkdir -p $NNI_SYS_DIR/code && cp -r $NNI_CODE_DIR/. $NNI_SYS_DIR/code && sh $NNI_SYS_DIR/install_nni.sh \
 && cd $NNI_SYS_DIR/code && python3 -m nni_trial_tool.trial_keeper --trial_command '{7}' --nnimanager_ip '{8}' --nnimanager_port '{9}' \
---nni_manager_version '{10}' --log_collection '{11}'`;
+--nni_manager_version '{10}' --log_collection '{11}' | tee $NNI_OUTPUT_DIR/trial.log`;