Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: vm: start-new-vm: Copy deployment image to clean VM"
  - xci: vm: start-new-vm: Copy deployment image to clean VM

    In order to save us some time and bandwidth we can copy the deployment
    image to the clean VM in order to be used by bifrost to prepare the
    virtual machines. Moreover, we also put our key there so we can ssh
    as the root user.

    Change-Id: Id21e19aaefde71862c21180129c664c1bf121c32
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 6b6a564..dd57783 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 6b6a564f3479ab834d9a55d4b6e180601e8e1c6a
+Subproject commit dd57783ddb07c53defe740a83d1ad03bb8070442