Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 3690db02a3035306d6be5fae7529a2f27b90ee71
  - Merge "JUnit tests for VfcManager"
  - JUnit tests for VfcManager

    Increased junit tests coverage according to Sonar analyses.
    Added missing tests for VfcManager.

    Change-Id: Ib0057f4f8179f088fe4e94df563a3053601758e7
    Issue-ID: SO-1692
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 8a0c54a..3690db0 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 8a0c54a2e9c873771fd30e9e13749567916e2099
+Subproject commit 3690db02a3035306d6be5fae7529a2f27b90ee71