This allows to replicate updates to the refs/sequences/* branches in
All-Users and All-Projects. Replicating these refs is not needed for
Gerrit slaves (since they do not create new accounts or changes) but
replicating these refs may be wanted if the replication target is a
Gerrit backup server.
Change-Id: Ib1d21a646d89b2e774dc9d50574eb990b8d79ece
Signed-off-by: Edwin Kempin <ekempin@google.com>