Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to e840e62a5b19755134fc036ab0e3bcbaa06b74c1
  - Merge "change the update line to update the latest stack"
  - change the update line to update the latest stack

    fix the unit test for latest stack update
    change the update line to update the latest stack

    Change-Id: I8b7f903c9f7bbae1163f1363a19f18b2803f558c
    Issue-ID: SO-1977
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 045294c..e840e62 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 045294cc45d32bcf6086e2456488e7bedb897e72
+Subproject commit e840e62a5b19755134fc036ab0e3bcbaa06b74c1