Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 7e9581d1cab9604abdf0c3397877a100567bc33c
  - Merge "update readme.md"
  - update readme.md

    Updated developer documentation in readme.md:
    components, how to compile, format, build docker images,
    images list, how to start them

    Issue-ID: SO-2148
    Signed-off-by: Katsiaryna Kazak <k.kazak@samsung.com>
    Change-Id: Ib0e8e78af3e4497d8d9a6789c3af49f7025ba428

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 5128f15..7e9581d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 5128f152409017604d97b1e2f711a77a4c3acdf3
+Subproject commit 7e9581d1cab9604abdf0c3397877a100567bc33c