Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Integrate functest

    This change integrates functest in most easiest and messy way to
    get it up and running to bring functest into CI. The reason for
    this is that there are strange failures during functest healthcheck
    and it is important to look into those rather than beautifying how
    functest is integrated at this phase.

    Change-Id: I42e993be4aa15da022fa1e0069338447780f177e
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>