Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 21efdd9394ac85637eb9e3531e0b78d7f1f09d41
  - Merge "set multi-stage flag in listener to log success"
  - set multi-stage flag in listener to log success

    fixed null pointer error when multistage not set

    Issue-ID: SO-2159
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I1f2313d074bea404776877ef56607a814e46e514

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index c113f6e..21efdd9 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit c113f6e62d95392435f0194b8677e90f90cde09e
+Subproject commit 21efdd9394ac85637eb9e3531e0b78d7f1f09d41