Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Fix Xtesting workspace

    It completes "Publish Xtesting daily jobs" [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/66131/

    Change-Id: I82cd92f8ad3fd777868eba9875793846662cfddf
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9341d2e..f022b47 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9341d2e37026c0d65ede57cd417e91db93ea2e03
+Subproject commit f022b470e2828520e7179001c97dbecb449241c2