fix switchman settings initialization for rails 3

Change-Id: I926d13c5ce839e7236d8e2c7720be01e5e044eea
Reviewed-on: https://gerrit.instructure.com/29530
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>