Blocker Description
While working on the unified containerizer support, I noticed that I was seeing duplicate task events in the scheduler UI. On digging further, these events were present in the DB as well. Initially I thought it was related to the storage changes for task images, but I was able to reproduce on a sha before those changes were introduced.
I ran a git bisect to see what commit introduced this bug and it pointed to: https://github.com/apache/aurora/commit/915459dac76ed0732addce87420a4ba51d916de8
It's not immediately obvious to me how that change is causing this, especially since setting -populate_discovery_info=false in aurora-scheduler.conf does not fix the problem.
