Add a couple scripts from ngraph/contrib/docker. chown_files.sh solves a file…

Add a couple scripts from ngraph/contrib/docker.  chown_files.sh solves a file permissions problem involving mounted directories in docker images.

contrib/docker/chown_files.sh

+#!/bin/bash
+
+# the docker run commands leave output files with root ownership
+# modify the file ownership with the UID of the calling user  
+
+if [ -z $MY_UID ];then
+    MY_UID=`id -u`
+fi
+
+if [ -z $MY_GID ];then
+    MY_GID=`id -g`
+fi
+
+if [ -z $MY_ROOT_DIR ];then
+    MY_ROOT_DIR=/root/ngraph-test
+fi
+
+cd $MY_ROOT_DIR
+find . -user root > files_to_chown.txt
+cat files_to_chown.txt | xargs chown ${MY_UID} ${1}
+cat files_to_chown.txt | xargs chgrp ${MY_GID} ${1}
+rm files_to_chown.txt

contrib/docker/docker_cleanup.sh

+#!/bin/bash
+
+# list active docker containers
+echo "Active docker containers..."
+docker ps -a
+echo
+
+# clean up old docker containers
+echo "Removing Exited docker containers..." 
+docker ps -a | grep Exited | cut -f 1 -d ' ' | xargs docker rm -f ${1}
+echo
+
+#list docker images for ngraph
+echo "Docker images for ngraph..."
+docker images ngraph_* 
+echo
+
+# clean up docker images no longer in use
+echo "Removing docker images for ngraph..." 
+docker images -qa ngraph_* | xargs docker rmi -f ${1}