Currently flag parsing seems to call Set twice, which causes problems
with encryption keys. We can clear for every set for now.
Change-Id: Id5c695b4020194ac1c50a2da9c7d2a896cb9216f
This adds EncryptionKey definition that can be used as a flag.
These order.EncryptionKey-s will be used to encrypt data in
order limits.
This helps to avoid storing lots of transient data in the
main database.
This code doesn't yet contain encryption itself.
Change-Id: I2efae102a89b851d33342a0106f8d8b3f35119bb
