Update git submodules

Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - p/fuel: armband formula: Refresh nova patches

    Rework armband salt formula, focusing on nova libvirt driver patches:
    - Switch from multiple individual patches to a single roll-up patch:
      * Patch is now applied for python directory instead of each file;
      * Expected hash is now 'False' (no hash checking for whole dir);
      * Added 'unless' condition to skip patching when already applied.
        Replaces old hash mechanism which was broken anyway when multiple
        patches are applied to the same file;
    - nova: Switch guest video from VGA to virtio (replace our old
      standard VGA default patch with upstream backport);
    - nova: Skip config/patch if 'python-nova' is not installed
      (e.g. for KVM nodes);
    - nova: Support Qemu >= 2.10 (backport);
    - libvirt: Re-enable Apparmor security driver on compute nodes;
    - armband state is now fully re-entrant;

    JIRA: ARMBAND-306
    JIRA: ARMBAND-318
    JIRA: ARMBAND-320
    JIRA: ARMBAND-331

    Change-Id: I48c09b10be030aa1ab4424b76876bf3dabd40fd2
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit ae49b614d29351d07e317ca792865ae74d0c5fb7)