Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add docker image tag for euphrates"
  - Add docker image tag for euphrates

    Update aarch64 jjb yml patch file with euphrates BRANCH

    Signed-off-by: Delia Popescu <delia.popescu@enea.com>
    Change-Id: Idbad0fdc1721182781fe26bf1963167fe8dd844a

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b64574e..104de70 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b64574e2917e2c3633177267eb8b93b901eff53a
+Subproject commit 104de705d9530c061925b0fb858ac2acf4b074c1