Fix saving the user/group access list for repositories.
Review Request #10518 — Created April 4, 2019 and submitted
We had a regression in repository saving where the user and group access
lists weren't being saved. While users would be validated against the
user list, any changes made would be thrown out. The solution was to add
save_m2m()call (which is needed when choosing not to immediately
save the model to the database through
commit=False). Unit tests were
added to catch regressions here in the future.
Unit tests pass.
Verified manually that I could alter the users and groups lists without