Update git submodules

* Update docs/submodules/orchestra from branch 'stable/euphrates'
  - Extended documentation for Euphrates

    Inlcuded user guide and configuration guide that can be used to get started immediately with orchestra

    Change-Id: Idec9cf8462b0497addc8419fb77744a639fd8718
    Signed-off-by: Giuseppe Carella <cargius@gmail.com>
    Signed-off-by: Michael Pauls <michael.pauls@fokus.fraunhofer.de>
    (cherry picked from commit dca493fb41c38de1618b64084565d5fc46c9c3cf)

diff --git a/docs/submodules/orchestra b/docs/submodules/orchestra
index d897a8f..9ddde2b 160000 (submodule)
--- a/docs/submodules/orchestra
+++ b/docs/submodules/orchestra
@@ -1 +1 @@
-Subproject commit d897a8fae077e366a9a9e1fa53d160b0db6e356a
+Subproject commit 9ddde2b8fff89b81fd675eed5af115c0eb0656ae