Update git submodules

* Update docs/submodules/releng from branch 'master'
  to e53a85c67d988af36ac4e510fb0172e51986eeb7
  - Allow triggering nfvbench jobs by comments

    Change-Id: Ia364e52e170fa99cc8de33faec1ae59776e03db0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b0204d2..e53a85c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b0204d2dd14cb975ac02c6eb40b28759f52d7ae6
+Subproject commit e53a85c67d988af36ac4e510fb0172e51986eeb7