Update git submodules

* Update docs/submodules/fds from branch 'stable/euphrates'
  - Euphrates documenation updates

    Removed revisions since they're not needed.
    Also added dvr scenario.

    Change-Id: I982d557a243c02a0847187312733728b3d82f1dc
    Signed-off-by: juraj.linkes <jlinkes@cisco.com>
    (cherry picked from commit d1d2da58d3a7eaa1b64e94ceb1e02c39d19886de)

diff --git a/docs/submodules/fds b/docs/submodules/fds
index 3982320..ff041aa 160000 (submodule)
--- a/docs/submodules/fds
+++ b/docs/submodules/fds
@@ -1 +1 @@
-Subproject commit 3982320b7abbd82d7b512136af608d4a51870a32
+Subproject commit ff041aa3f64473ce9e334c4e8f51720f4904de4f