Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 31e4876968f144b875e21f4499701ba2f16dc94f
  - Merge "1911 create appc adapter micro service"
  - 1911 create appc adapter micro service

    Added new appc adapter micro service.
    Made required code changes to use the new adapter.

    Issue-ID: SO-2596
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I880ecace64ec85ca4094a82bc1210798fd3bb85d

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index e6d05b9..31e4876 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit e6d05b9359582d2a8bddfeb73527d134586410b7
+Subproject commit 31e4876968f144b875e21f4499701ba2f16dc94f