Multetenant Upgrade related issues

[YaleChen299]

This issue serves to document some bugs and improvement for the on-going multitenant upgrade project.

[YaleChen299]

Test needed

• places which complex constraints with course_id. (e.g. assessment number and course_id)
• update xml generator and test with new testcase format and attributes.

[YaleChen299]

Issues

• handle removal of staff member from course.
• swagger documentation
• more
• remove the use of ecto schema in migration.
• auth name spacing in user table column

[martin-henz]

Looking through the open issues. What it the status? @YaleChen299 ? @angelsl ?

[angelsl]

Don't think any work has been done here yet. I'll see if I can look into this in January.