Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to d402a7d0e3bfdfbd2a3d6cfce2c9f170a30c4192
  - Merge "Sonar comments fixed Removed commented lines/ Change static string litrals name according to the guidelines. Issue-ID: SO-1490"
  - Sonar comments fixed
    Removed commented lines/ Change static string litrals name according to the guidelines.
    Issue-ID: SO-1490

    Change-Id: I77a0b2a5067d71ede2de8e090ed4d0b1fb61e219
    Signed-off-by: Subhosree Pan <subhosree.pan1@huawei.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 57b9a52..d402a7d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 57b9a52289ab4c4590a9cb7c5a537c3484bfe28a
+Subproject commit d402a7d0e3bfdfbd2a3d6cfce2c9f170a30c4192