Fix file encoding migration
Summary:
See Discourse
When migrating to aes-256-cbc, integrity hashes were not updated, so data was not properly
Test Plan:
I ran this test script to ensure it worked.
I created some files with lipsum, ensured that after encoding them with aes-256-cbc, they were not able to be cat'd.
After applying this patch and rerunning the script, it worked successfully.
Reviewers: epriestley, amckinley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin
Tags: Files, #storage
Differential Revision: https://secure.phabricator.com/D19533