Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b9bb7f60815cd1e07b81d72b34ea1dcb4fa8d8c9
  - Merge "use logger to log exception"
  - use logger to log exception

    sonar link:https://sonar.onap.org/project/issues?id=org.onap.so%3Aso&resolved=false&types=VULNERABILITY

    Issue-ID: SO-1859
    Change-Id: I599ca396db3d24cbef56bb3aea8f83b2d52ff26d
    Signed-off-by: arindamm <arind.mondal@samsung.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 499730c..b9bb7f6 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 499730cede8f283147e5a0cd37fca9822221b1e1
+Subproject commit b9bb7f60815cd1e07b81d72b34ea1dcb4fa8d8c9