Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Create jobs for euphrates"
  - Create jobs for euphrates

    Change-Id: I700eb3c113889cb70b3df7a8cfa4faf5e37ffce5
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7d4fa2b..8d4cb2d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7d4fa2bbe59b5d06596c7cd1b9f3c8141ce62894
+Subproject commit 8d4cb2dbd358b98e3ca060333276a96769056457