* Update plugins/replication from branch 'master'
to 63fb2b4ba85380d798acbdc076e8673353507569
- Convert ReplicateRefUpdate to AutoValue
This class is a simple data container. The tests will be simpler if they
don't need to implement their own equals().
Use auto-value-gson to automatically create Gson TypeAdapterFactories
for ReplicateRefUpdate.
Change-Id: I07e6d6e9857dcdf92bb148cca01cd05894799cdb