Clientside Docker vnode support.
See clientside/tmcc/linux/docker/README.md for design notes. See clientside/tmcc/linux/docker/dockerfiles/README.md for a description of how we automatically Emulabize existing Docker images. Also, this mostly fits within the existing vnodesetup path, but I did modify mkvnode.pl to allow the libvnode backend to provide a vnodePoll wait loop instead of the builtin vnodeState loop.
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