Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "bottlenecks: enable euphrates docker"
  - bottlenecks: enable euphrates docker

    Change-Id: I5bcd55f30745f71aedda1e60df57b761e2657c22
    Signed-off-by: liyin <liyin11@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9f519d9..88f0b85 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9f519d9fe4de5312965c957d9d52754ffec77e56
+Subproject commit 88f0b856c18abca765a3d4a6da1f7849096b9b73