run extend_shackles initializer before ar initialization
run extend_shackles initializer before ar initialization

Change-Id: Ie6a47da32e350b2307bd349d68253d48b8143269
Reviewed-on: https://gerrit.instructure.com/35959
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

krrg/switchman,instructure/switchman,instructure/switchman,ccutrer/switchman