Update git submodules

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

    Change-Id: I167bbea911fb3aee6fa21b7ff28b18d7fae61bb9
    Signed-off-by: agardner <agardner@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d7f9cb9..9380666 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d7f9cb927085b4edf95e71d8c3e49007e3b03276
+Subproject commit 9380666a19dc94aa270730b40517e51a9f318958