Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 3dc507947c81807371babbd275d7caf0c3521e5d
  - Improvements in RequestClientFactory

    Improvements in RequestClientFactory according to the Sonar analysis.
    Fixed imports.
    Removed unnecessary exceptions handling.
    Replaced depreciated  DefaultHttpClient with a new one.

    Issue-ID: SO-1947
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: Id497bfb620775aac67ad4c5f6d57e0fccce4fd34

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index af23464..3dc5079 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit af23464d5dcac4aa493fde21fb1beff40c5e1b9c
+Subproject commit 3dc507947c81807371babbd275d7caf0c3521e5d