Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Change Euphrates image

    minor pylint fix in functest/reporting-status

    Change-Id: Ibfd4f0da1475c34c40a3d9e00530f8f15eb3c7dc
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 250d6cf..ea3d8e4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 250d6cffbc53074d84971bffec1395322eb5a3ab
+Subproject commit ea3d8e4f58bc7d1a236870ce9461a36e6196842e