add region helper method stubs on DefaultShard

Change-Id: I6f4c255daba0d8eac688c399a62a2cb5362b034d
Reviewed-on: https://gerrit.instructure.com/42859
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Rob Orton <rob@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>