Related to: #2593 and #943
Copied from: #2568, #2184

One-off containers created by docker-compose run are not removed by default, and aren't removed by docker-compose rm.

We should do at least one of the following:

1. Make --rm flag default for fig run #943 - make --rm the default for run
2. add a flag to rm to include one-off containers
3. remove one-off containers as part of rm by default