Hi folks, Both Docker Sandbox[1] and Vagrant Provisioner[2] are not updated/maintained for a long time. I propose to remove those code to improve our codebase readability and eliminate potential bugs yield by non-active maintained code. I'll wait for 3 days. If there are no objections I'll proceed with a PR.
[1] https://github.com/apache/bigtop/tree/master/docker/sandbox [2] https://github.com/apache/bigtop/tree/master/provisioner/vagrant
