Set developer_key_management_ui_rewrite to not be seen in prod
Set developer_key_management_ui_rewrite to not be seen in prod

Refs: PLAT-3185

Test Plan: Verify only shows in site-admin.  Not shown in root accounts
or sub accounts

Change-Id: I95d867abb603013e0bef32710b2692ba1cb1a4cf
Reviewed-on: https://gerrit.instructure.com/142855
Reviewed-by: Nathan Mills <10b0771d20c18ad0d98c1d000665e443052b40b0@instructure.com>
Tested-by: Jenkins
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Product-Review: Stewie aka Nicholas Stewart <bec99285d8f1953757afca2af84365b0776c1eb4@instructure.com>

instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms