In the context of edx-platform django settings, devstack_docker is an alias to devstack. Both are deprecated, technically, but we currently want to remove all devstack-related settings files except devstack.py (which tutor still uses). So, in order to remove devstack_docker.py, we update its references to devstack.py
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.