Update git submodules

* Update docs/submodules/dmaap/messagerouter/messageservice.git from branch 'dublin'
  to 13681930ceee96f9bca580c00e2ba55e54f53a75
  - adding release notes for the Dublin release

    Change-Id: I0b2244b8f6da197ae667a5ab7afa37876fd41f88
    Signed-off-by: Mandar Sawant <ms5838@att.com>
    Issue-ID: DMAAP-1215
    (cherry picked from commit c372b8a6e188f6120ccdfae71593e22ed8a6da40)

diff --git a/docs/submodules/dmaap/messagerouter/messageservice.git b/docs/submodules/dmaap/messagerouter/messageservice.git
index 32a312c..1368193 160000 (submodule)
--- a/docs/submodules/dmaap/messagerouter/messageservice.git
+++ b/docs/submodules/dmaap/messagerouter/messageservice.git
@@ -1 +1 @@
-Subproject commit 32a312c7094841489ee5611d8c9fca55382954bd
+Subproject commit 13681930ceee96f9bca580c00e2ba55e54f53a75