Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Temporarily disable perm (tox)

    The permissions are incorrect in functest-virtual [1].

    [1] https://build.opnfv.org/ci/job/opnfv-functest-latest-ut-gate/2/console

    Change-Id: I18b0bc3361b99316c0f77207e3c060333f8fcc74
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index afa13d6..34a6987 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit afa13d6ee8b87c8e63e71fa2ceead357396b8f70
+Subproject commit 34a6987ea156fabff41678ed8c052c7990694a89