Update git submodules

* Update docs/submodules/releng from branch 'master'
  to e12c36857ca46451c79355165ea13e02ba31eb74
  - Fix releng-release-create-venv.sh

    https://build.opnfv.org/ci/job/releng-release-v1.25-verify/1/console

    Change-Id: I5365e37d89eb736cf33459d9c3e0a14e54f5fdb4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a42e670..e12c368 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a42e670c3dcebc19c125f2173790fc5a0d0794e5
+Subproject commit e12c36857ca46451c79355165ea13e02ba31eb74