Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0ca2124cb7da285607f58e2926923d27c82491e5
  - Swith to tox package

    Change-Id: I8be6af9a1c2c8b6b095fd0b5f27a27d4c50b8a26
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 02f2301..0ca2124 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 02f2301e294cb1db7044231ba7467e49abc347ec
+Subproject commit 0ca2124cb7da285607f58e2926923d27c82491e5