Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: Merge configure-network and syncronize-time roles"
  - xci: Merge configure-network and syncronize-time roles

    Those roles were too small and only used as part of the host
    bootstrapping process. As such, we merge them into a common
    'bootstrap-host' role which can be used to prepare the hosts
    after the initial deployment

    Change-Id: Ifc84cf40b98ced91b31aae699dc28e9642380550
    Signed-off-by: Markos Chandras <mchandras@suse.de>