Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Do not fail the if virsh command fails

    Change-Id: Id9c55b45719399c6c78c0d3d8b97926a2907b7f8
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index fa74516..79bc416 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit fa745164fdd4955cdd1c6af5164d83146575b14b
+Subproject commit 79bc4163f96fd3d470fde2eac1597c0637ac7ac8