Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to f4c4f91985b5efca53c25dd518ebadc00559f160
  - Merge "Remove MsoLogger from 'mso-adapter-utils'"
  - Remove MsoLogger from 'mso-adapter-utils'

    Removed MsoLogger from adapters ('mso-adapter-utils')
    Replaced MsoLogger with plain slf4j
    Refactored login output
    Fixed imports

    Change-Id: I5805427f3d6870a35f523934ceee73f17d4e130d
    Issue-ID: LOG-631
    Signed-off-by: k.kazak <k.kazak@samsung.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index bf30a54..f4c4f91 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit bf30a54577bf315ffdf71b7098c3528c6fddfa23
+Subproject commit f4c4f91985b5efca53c25dd518ebadc00559f160