Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to d99c3ef191d843649545afbd9d0689aaf5947c60
  - Merge "Fix so-simulator dependency in docker/pom.xml"
  - Fix so-simulator dependency in docker/pom.xml
    
    Issue-ID: SO-2622
    Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
    Change-Id: I30b787bc697e48b4e1b21ec84b8abaeff52a5971
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index f2dabed..d99c3ef 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit f2dabed6905bd921a9ffb635d349ef8ad8063c6d
+Subproject commit d99c3ef191d843649545afbd9d0689aaf5947c60