Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: scripts: start-new-vm.sh: Set JENKINS_HOME on local runs

    If we are creating a new virtual machine for local testing, then we
    should set JENKINS_HOME since some playbooks use this variable to
    determine if the deployment happens on a CI or not. That script aims
    to simulate a CI deployment so it should have this variable set.

    Change-Id: I1165c8b2cd467ba92fcf6f6c178a69b07834894e
    Signed-off-by: Markos Chandras <mchandras@suse.de>