Adds passcodeEncryptionCode to user keychain
Adds passcodeEncryptionCode to user keychain

Reviewers: barath, benchan

Reviewed By: benchan

Subscribers: ben

Differential Revision: https://phabricator.bitgo.com/D2975

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS