Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Revert "[FN VMs] remove graphics"

    RHEL family virtualization tools reserve 02:00 PCI slot for VGA, even
    if 'nographics' is specified when creating the VM (in case the user
    wants to later hook a video card, which usually *requires* PCI slot2).

    Debian systems do not follow this rule (tested with libvirt 1.x, 2.x,
    3.x), hence 1st NIC lands on PCI slot 2 (and get eth name 'ens2').

    To align the behavior across all possible jumpserver distros, bring
    back the virtio video.

    This reverts commit 738f6c3b68d1179de1ff790f9e72c25f10874da4.

    Change-Id: Ifd855c12e04aec1ff0ab047b13f8081365741889
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f74201b..6ccfee5 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f74201bebff81f8719b3ffe593e8d7ded50730a8
+Subproject commit 6ccfee59ea7225cfc46227e7e874835dc75dc575