Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[fuel] Disable Euphrates triggers"
  - [fuel] Disable Euphrates triggers

    Change-Id: I3fd11c6efb13f46ec74a0237a180497397cdfefe
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 11e4d1f..d68216e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 11e4d1f751f7e708104528562260a6f3d3d6c9fd
+Subproject commit d68216e49d65ebbbb386d5e8906a51374c03b31a