Update git submodules

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

    Change-Id: I8a223d7f9a0458f9cc01a2fedcb630b711b4465f
    Signed-off-by: agardner <agardner@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b0d627d..62f14a6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b0d627deb61ef6f6f9381c2e83401853da3999f7
+Subproject commit 62f14a6f19be241f0f4bd6634214eba0ccc8905a