pre_supervisor expects to run the migrate tests as the supervisor user,
which does not have sudo.  Add an env variable flag that allows you to
claim "I know what I'm doing, don't sudo".

migrate-edxapp-lms is templated to know if a given image points to 1, 2
or even 3 databases.  We don't have that knowledge in pre_supervisor
without parsing lms.auth.json for DATABASES and adding a bunch of
special-case logic.

This dates from when our code was if lms/cms, else xque, else
new_service.  Now that lms/cms are lumped into new_services, name it
services.

This adds some helper scripts for managing the edx server.

Supervisor could wait up to 5 days for workers to finish jobs. So
Upstart needs to wait that long for supervisor to finish.

In order to let supervisor run by the jenkins user. Don't use the word daemon in the process call.

In order to support --check we need to ensure that registered
vars exist before checking their stdout. Otherwise ansible
errors out.