Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 6c9e17ce89ec50468371247bb34881bdfcfc9fbd
  - Merge "Major Sonar fixes"
  - Major Sonar fixes

    Major Sonar fixes in different classes:
    -Removed unused variables.
    -Simplified diamond operators.
    -Removed unnecessary imports.
    -Removed unnecessary code.

    Issue-ID: SO-2102
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: Ib54fbe048700a4e31042481f0a9b13838552aee7

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 597aba0..6c9e17c 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 597aba038c90ef34a8058794c73a2213d778673e
+Subproject commit 6c9e17ce89ec50468371247bb34881bdfcfc9fbd