[Hawkular-dev] docker clean up

Just a little set of tricks that might be helpful to others. If you want to clean up your docker: * Delete all containers: docker ps -q -a | xargs docker rm * Delete all images: docker rmi $(docker images --filter dangling=true) * Another way of removing all images is: docker images -q | xargs docker rmi * If images have dependent children, forced removal is via the -f flag: docker images -q | xargs docker rmi -f * Delete untagged images: docker rmi $(docker images | grep "^<none>" | awk '{print $3}')