Summary: Ref T5884. We migrated with "canCDN" and then had live writes with "cancdn". Move everything to "canCDN" for consistency.
Test Plan: Ran migration, verified DB only has "canCDN" afterward.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T5884
Differential Revision: https://secure.phabricator.com/D10273
