Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: kubespray: Add experimental support for openSUSE"
  - xci: kubespray: Add experimental support for openSUSE

    Add experimental support for openSUSE until the upstream PR
    is accepted

    installer-type:kubespray
    deploy-scenario:k8-nosdn-nofeature
    Change-Id: Icd3698d882d249a18be77560ba0ba52159893816
Link: https://github.com/kubernetes-incubator/kubespray/pull/2380
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index d729e58..9578c33 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit d729e58ed182923414456569ba68aa4868fed885
+Subproject commit 9578c33b0eef82154f7a5867d5c7661c67a025bc