spec: http timeout decrease selenium

Change-Id: I821b60f59f4c08789b14c6f975086655ccd20529
Reviewed-on: https://gerrit.instructure.com/32577
Reviewed-by: Shawn Meredith <shawn@instructure.com>
Product-Review: Shawn Meredith <shawn@instructure.com>
QA-Review: Shawn Meredith <shawn@instructure.com>
Tested-by: Shawn Meredith <shawn@instructure.com>