Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - lib.sh: cleanup_vms: Also remove stopped MCP VMs

    In case the cfg01 & co. VMs are in "shut off" state, `virsh --name`
    will ommit them, which leads to `cleanup_vms` leaving behind stale
    VMs. Add `--all` arg to list all VMs, including stopped ones.

    Change-Id: Ia550a10eb0b40138f87ade709336c2871a8b1cd8
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 5c3b0e9..4651bb2 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 5c3b0e9a51e3486ae660685a3c33aed0e39c5ab2
+Subproject commit 4651bb2a7257be49c9ca6ce5c959de66e6800005