Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 4f8e8687225ec663551786533e93ec67b607ac9e
  - Merge "Major Sonar fixes in E2EServiceInstances"
  - Major Sonar fixes in E2EServiceInstances

    -Removed unnecessary code.
    -Removed unused variables.
    -Introduced constants for repeating Strings.

    Issue-ID: SO-2102
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: I4ac692849508178390796d149b2c3f2fddcd093b

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index b6ffa5d..4f8e868 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit b6ffa5d514cda289b1052b405067a04b2819c43e
+Subproject commit 4f8e8687225ec663551786533e93ec67b607ac9e