Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Run tox in functest-virtual"
  - Run tox in functest-virtual

    It will replace the former jjb and avoids running functional tests if
    the patchset is wrong.

    Change-Id: I4264780180d953b0dac0febf1f1c2dc2d08f93c6
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 14eb51f..2caa2e6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 14eb51f41f7cf67bf0c1946f2ce65a65cabaa8d3
+Subproject commit 2caa2e6d5b210efb88e28aeb21d7a945da4fb1f0