spec: testbot rspec tagging

Change-Id: I20a5069fee3a5b75cc0208f312ea4135fd525bc4
Reviewed-on: https://gerrit.instructure.com/41519
Reviewed-by: Kyle Rosenbaum <kyler@instructure.com>
Product-Review: Shawn Meredith <shawn@instructure.com>
QA-Review: Shawn Meredith <shawn@instructure.com>
Tested-by: Shawn Meredith <shawn@instructure.com>