Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to af1874da7e288ab64aac169421146e442293e26e
  - Merge "Sonar fixes and improvements"
  - Sonar fixes and improvements

    General fixes and improvements according to the Sonar analysis.
    -Fixed imports.
    -Removed unnecessary code.

    Issue-ID: SO-1992
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: I4299f3efc4444625f70fc36e65b57c500b113596

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index f417537..af1874d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit f417537f5258530ed15ceaec111ce08a24ad6487
+Subproject commit af1874da7e288ab64aac169421146e442293e26e