Update git submodules

* Update docs/submodules/so.git from branch 'casablanca'
  to 5c30fcae92fb47b40e232153db2671ca49aebef4
  - Update Working with SO Docker Documentation

    patch description: Update Working with SO Docker
    documentation for casablanca release.

    Change-Id: If7a4601e83e0ca83f99a9f74e1f282abc3854bdd
    Issue-ID: SO-1505
    Signed-off-by: mohamed waly <mohamed.waly@orange.com>
    (cherry picked from commit 1a168f5abde6952e07077d816d12f457ad95e863)

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 4df0c94..5c30fca 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 4df0c947adfefede060694dbde0ae94106184da5
+Subproject commit 5c30fcae92fb47b40e232153db2671ca49aebef4