Comment 9 for bug 1637223

So I had a look and it seems the dependence on python-websocket very weak; only one function in python-docker depends on websocket, and no code in Debian calls it. So I'd be happy to take the zesty versions of python-docker, dockerpty and docker-compose, drop the version from the build-dep on python-websocket and upload to Xenial.

(Oh yes, python-docker build-depends on a newer python-backports.ssl-match-hostname but the file it imports from there is exactly the same as in the package in xenial, so we can relax that requirement too).

I'll get the packages built in a ppa for testing and into the Xenial queue. Whoever from the SRU team reads this will probably want to check my working with reverse-depends ;-p