Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 4a236628def84575874810d61638aa640e51c804
  - Merge "Sonar fixes in MsoVnfAdapterAsyncImpl"
  - Sonar fixes in MsoVnfAdapterAsyncImpl

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

    Issue-ID: SO-1220
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: I0f9ab1fe490975e4eefa31afd5bf09616f4de3f2

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index af1874d..4a23662 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit af1874da7e288ab64aac169421146e442293e26e
+Subproject commit 4a236628def84575874810d61638aa640e51c804