Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [maas] AArch64: Preseed Armband repositories

    Preseed Armband common repo-comp for Pike, so we get
    the updated kernel & other packages from the start.
    Requires upstream PR [1].

    While at it, also handle related PR merged upstream [2] by
    explicitly setting maas.region.subnets name via j2 instead of reclass
    param expansion in name (allows us to drop the remaining chunk of the
    fabric-from-CIDR patch we used to carry).

    Note: opnfv_infra_maas_pxe_network_addres can now be dropped from
    pod_config j2 template in Pharos Fuel installer adapter.

    [1] https://github.com/salt-formulas/salt-formula-maas/pull/26
    [2] https://github.com/salt-formulas/salt-formula-maas/pull/22

    Change-Id: I356adb73b80f0f2d85db4ab060e804cb9a053862
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 52af46f2cac395e893007029d24d5365e27a4328)