Update git submodules

Update git submodules

* Update cinder from branch 'master'
  to ffc441fe5531a27bbc72d9eacb40c3d255f70102
  - Merge "NFS driver: Set volume format for snapshot operations"
  - NFS driver: Set volume format for snapshot operations

    On snapshot operations, the NFS driver does not properly update
    the volume format in admin_metadata to correspond to the format
    of the active snaphot, as in the case of offline snapshot
    creation, in which the driver does update the format to match
    the newly created qcow2 snapshot, resulting in the resizing
    operation to fail due to the format mismatch in the
    `qemu-img resize` command.

    This patch fixes such behavior by updating the volume format
    in volume_admin_metadata whenever the active snapshot is replaced.

    Change-Id: I7cacdd9b78820d272058e9c35f926e23b4c87ba4
    Signed-off-by: Fernando Ferraz Silva <fesilva@redhat.com>