Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to e44fee30ac2abded56a37bfe8e312d880ef8db53
  - Merge "Removed addition of null value to string to prevent static analyzer warning"
  - Removed addition of null value to string to
    prevent static analyzer warning

    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: Ib9dbd55f3688e38688668828778653eadc04a836

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 058deb4..e44fee3 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 058deb47d8edba65fdef6b5834fbf79ff9989e79
+Subproject commit e44fee30ac2abded56a37bfe8e312d880ef8db53