Streamline tango's docker image for wsuv use case

Currently Tango's dockerfile is built to support both distDocker and localDocker vmms. We're only planning to use distDocker going forward, so can simplify the tango docker image (no need for dind). This should live as a separate dockerfile, and the deployment script should use it, instead of the mainline file.

[ ] create separate dockerfile for wsuv image [ ] simplify dockerfile [ ] ensure dockerfile can be run effectively without '-i' [ ] consider putting logs onto the host file system