Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to ab18c3ca22cff9e2bba5bddda0a50987541cf173
  - Merge "Vulnerability fixes in ServicePluginFactory"
  - Vulnerability fixes in ServicePluginFactory

    Vulnerability fixes in ServicePluginFactory according to the Sonar.
    -Made constants final.
    -Changed access scopes from public to private.

    Issue-ID: SDC-2106
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: Iabaca0bd138b5dee22c95a4a0cc6cb5ebe442fd2

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 128fcc3..ab18c3c 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 128fcc30cf60e9ddb3bc3df3c5486602f535f208
+Subproject commit ab18c3ca22cff9e2bba5bddda0a50987541cf173