Stable feature flags must be enabled before upgrades to ensure
the service can still start. These additional tasks check for
any disabled feature flags and enable them. This is done
immediately after upgrades so that systems can run with them
enabled striaght away.
Closes-Bug: #2038818
Change-Id: I5211a30899f544a9f7e609e85551a92b245d25bf
5abd7b71ba