Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "scripts: start-new-vm: Do not upgrade packages on the host"
  - scripts: start-new-vm: Do not upgrade packages on the host

    Upgrading the host could bring undesired side effects so we should
    not do that as part of CI deployment.

    Change-Id: Ib776cdf96943e22155c2dd47fdadb3e8a86f6143
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index d8035cd..21d793a 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit d8035cd012c941c615862e75ed54ad5fc3620846
+Subproject commit 21d793a1af489d8e68ad933adf7dfe10988344a4