* Update plugins/replication from branch 'stable-2.16'
to 18857e12579d841693c2dc39e9ee330ab36bca65
- Fix NPE when username or password isn't specified for remote
When the username or password is not specified, pass an empty
string instead of null.
Change-Id: I49121b9873eb9f2800417b6d264cc2ad82047f85