don't pass parallel option to recursive with_each_shard calls
don't pass parallel option to recursive with_each_shard calls

Change-Id: I461ddef91ae04328b5d9db535f6ad2566c175620
Reviewed-on: https://gerrit.instructure.com/31168
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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