Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Pass the OSA version to functest container

    OPNFV scenarios are forced to support at least two versions of OSA.
    If there are API changes between two supported versions of OpenStack,
    the testing code must have two versions. However, without knowing what
    OpenStack version is deployed, it is impossible to automate the
    decision of which testing code to use

    Change-Id: I3ca8c6f33c05826a5d69417da774b7218bbd59e2
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index d0c16a8..f6f8a15 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit d0c16a80bac11f52bba7cc6e7152ec47aababe1f
+Subproject commit f6f8a157851264d038a500707cbd5f46d0862057