Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Run all tests in a specific step

    It bypasses the missing senquential mode.
    It also fixes exclusions about fds and patrole.

    Several Functest could run in parallel but it's impossible from the
    time being due to an xtables lock.

    Change-Id: I831a8c995efbf2484afd86785f17f51981c921c1
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 91ad0c2..fe82048 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 91ad0c2a13d809efd36420e24d3db8854630d537
+Subproject commit fe8204895e7bf673e453f367be3c5e6a54a0716d