Update git submodules

* Update docs/submodules/releng from branch 'master'
  to be27febec62fdfccc85859bd9dfd6cd157feea15
  - Update tox

    Change-Id: I9d6e107d525482720aadeef55fe1e913694ff600
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0ca2124..be27feb 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0ca2124cb7da285607f58e2926923d27c82491e5
+Subproject commit be27febec62fdfccc85859bd9dfd6cd157feea15