pre-release for binary objects

The source files are not complete, but there are a few binaries that I anticipate will be helpful, and it will make pulls much quicker if I attach them here and incorporate them into the Docker build.

• Statically linked docker binary from https://github.com/rootless-containers/usernetes/releases/tag/v20190212.0
• Statically linked cvs binary built as described at https://github.com/eschen42/alpine-cbuilder#cvs-executable-independent-of-glibc
• Statically linked busybox binary built as described at https://github.com/eschen42/alpine-cbuilder#statically-linked-busybox