Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: scripts: start-new-vm.sh: Do not destroy user's configuration file"
  - xci: scripts: start-new-vm.sh: Do not destroy user's configuration file

    As we move towards making this script useful for developers, we
    shouldn't destroy the existing ssh configuration file but rather
    create a new one just for XCI. This also move the destruction of
    previous instances sooner, even before building the OS image so we
    can free resources as soon as possible. Finally, this also uses the
    hostname to ssh to the new VM instead of its IP to ensure that
    everything is setup up properly on the physical host.

    Change-Id: I185befd8943fdb8ebcdb635aefb4d4b03473258b
    Signed-off-by: Markos Chandras <mchandras@suse.de>