Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - [Baremetal] Include a baremetal variable

    It switches between parts of the code which are specific for baremetal
    or non-baremetal. Those parts come with this patch:

    https://gerrit.opnfv.org/gerrit/#/c/60797

    It also selects different variables when calling the opnfv-virtual.yml
    playbook:

    https://gerrit.opnfv.org/gerrit/#/c/60795

    It decides the value of BAREMETAL based on the vendor value of the pdf

    Change-Id: I8e6171f4f21db7f814a472e6ed1bacb30220b4ec
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 3fe7559..6158af2 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 3fe75598de97c73c95d83739e6ed11277b619988
+Subproject commit 6158af2f83842e3d6bdcba8c7ba93b4116b405ae