Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to c73fbf69cd7e66feca1ebfb35b8516bb183c585b
  - Improvements in ServiceInstances

    Improvements in ServiceInstances according to the Sonar analysis.
    -Fixed imports.
    -Removed unnecessary code.
    -Refactored diamond operators.

    Issue-ID: SO-2008
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: Ieb03f5b3fb52432091170402237ba4e23ed70e5d

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 33ce1d1..c73fbf6 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 33ce1d167c0daba899887b8ecd16b8a508cf12a0
+Subproject commit c73fbf69cd7e66feca1ebfb35b8516bb183c585b