Update git submodules

* Update plugins/replication from branch 'master'
  to 87a975dd6a62d383fc2d3914162365976123e1c2
  - Fix --remote option to replication start
    
    Declaring --remote as a 'Set<String>' field trips args4j's
    Setters.create(), which only treats List, Map, and Arrays as
    multi-value containers. Use a method-based @Option that adds
    each --remote value into a Set<String> to work around this.
    
    Change-Id: Ic4b4242f3c9ac05b822f2b62141ba34270619f70
    

plugins/replication

diff --git a/plugins/replication b/plugins/replication
index 9b78af8..87a975d 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 9b78af806be9cc7131a856f81051ee78d4f8c0e9
+Subproject commit 87a975dd6a62d383fc2d3914162365976123e1c2