Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 3f65ba0e3e311c5454fa8d7053d72ba11d025ff3
  - Merge "Set payload to empty when it is not specified"
  - Set payload to empty when it is not specified

    Handle a case of non-existent payload and improve error reporting on APPC request construction

    Issue-ID: SO-2300
    Signed-off-by: Kuleshov, Elena <evn@att.com>
    Change-Id: I93a1ac8ebfcaa0e39b26130e601d3b657cbed503

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index b8c0e78..3f65ba0 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit b8c0e788a07b6f7c9f72239fa6c2baf48a72332f
+Subproject commit 3f65ba0e3e311c5454fa8d7053d72ba11d025ff3