Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to c599aaba3cf6c205fd1bb2f8641b01b31695ec98
  - Merge "Added null check to server.getImage() to prevent crash at getId() call."
  - Added null check to server.getImage() to prevent
    crash at getId() call.

    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: I6ecaf66649e9df971003268b7272f677c5394083

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 3b007e2..c599aab 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 3b007e23e4acca0405db0fd18f05195d49c4f988
+Subproject commit c599aaba3cf6c205fd1bb2f8641b01b31695ec98