Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 9dfac1f8a822ef3e904f5f594120e9d8d450e248
  - Merge "Prevent race conditions on same distributionId."
  - Prevent race conditions on same distributionId.

    - Code to include optimistic lock to prevent race conditions on same
    distributionId.

    Change-Id: Ibe110b32f2472d991a4a3e03e3d15d5e4deefd65
    Issue-ID: SO-1566
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 489b742..9dfac1f 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 489b742f855a9248afbbd442eb70c52ba3b36ecc
+Subproject commit 9dfac1f8a822ef3e904f5f594120e9d8d450e248