clear cache in a deploy block
clear cache in a deploy block

Change-Id: Iaeec18d9ccef04e7ceaf8ee9ee0cde7b31056425
Reviewed-on: https://gerrit.instructure.com/164245
Tested-by: Jenkins
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

instructure/switchman,instructure/switchman