Update git submodules

* Update docs/submodules/msb/discovery.git from branch 'master'
  to b9bf181a6ece4f03735e75c6af350690cef24787
  - Update jetty-http
    
    Issue-ID: MSB-328
    Change-Id: I5e36767707d2321fa179b3339c15a4b9202dd8e3
    Signed-off-by: Huabing Zhao <zhaohuabing@gmail.com>
    
diff --git a/docs/submodules/msb/discovery.git b/docs/submodules/msb/discovery.git
index 6e8c095..b9bf181 160000
--- a/docs/submodules/msb/discovery.git
+++ b/docs/submodules/msb/discovery.git
@@ -1 +1 @@
-Subproject commit 6e8c095cac0871e8866580d9e3de4c85fa188a01
+Subproject commit b9bf181a6ece4f03735e75c6af350690cef24787