refs CNVS-17788
so you can easily tell the difference between how long a batch took
vs. how long it took to start
test plan:
* upload an SIS batch and let it run
* when you view it via the API, it should include a started_at
timestamp
Change-Id: I142024f82260c2ba690a950a09365e90c18cd43d
Reviewed-on: https://gerrit.instructure.com/47412
Reviewed-by: Rob Orton <rob@instructure.com>
Tested-by: Jenkins
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>