Update git submodules

* Update docs/submodules/releng from branch 'master'
  - jjb: xci: xci-verify-jobs: Fix XCI VM names

    The XCI script now uses more accurate VM names, so replace
    the VM name in the destroy job as well.

    Change-Id: Ia4c8ea204ecaa6ae765ce67aff3923dabab6d5f0
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 941759d..1b4a945 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 941759da987a3d24d9eee704c83163c8931359b9
+Subproject commit 1b4a9451bbb39caf636e9ffa1b10feba3c3e2c7a