Group CLI demo into subdirectory. (#6258)

CLI is not most developed interface. Putting them into correct directory can help new users to avoid it as most of the use cases are from a language binding.

demo/CLI/distributed-training/run_aws.sh

@@ -0,0 +1,11 @@
+# This is the example script to run distributed xgboost on AWS.
+# Change the following two lines for configuration
+
+export BUCKET=mybucket
+
+# submit the job to YARN
+../../../dmlc-core/tracker/dmlc-submit --cluster=yarn --num-workers=2 --worker-cores=2\
+				       ../../../xgboost mushroom.aws.conf nthread=2\
+				       data=s3://${BUCKET}/xgb-demo/train\
+				       eval[test]=s3://${BUCKET}/xgb-demo/test\
+				       model_dir=s3://${BUCKET}/xgb-demo/model