use legacy verifiers for eportfolios
use legacy verifiers for eportfolios

properly checking permissions for these is problematic, likely
due to race conditions involved with eportfolios' use of
session-based permissions.

turn it off for now just to make eportfolio attachments work.

test plan:
 - attachments to private eportfolios shared by verifier link
   should function

fixes CNVS-20193

Change-Id: Ia6a170f5de83efcf5cae2d8d9fc46f31ebce0ed9
Reviewed-on: https://gerrit.instructure.com/53334
Tested-by: Jenkins
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: Jahnavi Yetukuri <ed2b2672ccc2e59e56c0615df7f01b579202e014@instructure.com>
Product-Review: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>

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