Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Make volumes appear as SCSI devices in aarch64

    Adding volumes in openstack by default uses virtio_blk and the
    devices appear as /dev/vdX. In aarch64 however a qemu pci slot
    is already in use so the tests cannot assign more than one volume
    to a VM. Forcing the drives to use virtio-scsi solves the issue
    and allows more volumes to be attached as /dev/sdX. The variable
    defining the drive is VOLUME_DEVICE_NAME and is passed as
    environmental variable when the container is created.

    JIRA: ARMBAND-376

    Change-Id: Ia688cff338ff319e22a3b26796fa197297c23ce0
    Signed-off-by: Charalampos Kominos <Charalampos.Kominos@enea.com>
    (cherry picked from commit a663c33645681f66ebe6b6af79c4e9f5910fb26b)