Update git submodules

* Update docs/submodules/dmaap/messagerouter/messageservice.git from branch 'master'
  to 777dc0870530a3755a8fb16fc95ae99cd4d8fa12
  - update frankfurt release notes

    Issue-ID: DMAAP-1441
    Change-Id: I65722fe7eda5338bc4ea0680009244001e7451ae
    Signed-off-by: su622b <su622b@att.com>

diff --git a/docs/submodules/dmaap/messagerouter/messageservice.git b/docs/submodules/dmaap/messagerouter/messageservice.git
index 9cb7de4..777dc08 160000 (submodule)
--- a/docs/submodules/dmaap/messagerouter/messageservice.git
+++ b/docs/submodules/dmaap/messagerouter/messageservice.git
@@ -1 +1 @@
-Subproject commit 9cb7de44ab074cdbc1c6655835586c7fce2c6577
+Subproject commit 777dc0870530a3755a8fb16fc95ae99cd4d8fa12