Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - lib.sh: Use host-passthrough when spawning VMs

    virsh defaults to using "host-model" instead of "host-passthrough",
    which not only might lead to a small performance hit on x86, it is
    also causing compatibility issues with libvirt 3.x.

    Address this by explicitly requesting "host-passthrough" as the
    CPU model for virt-install.

    Change-Id: Ia7c5e8ff906c02fed2193c268cbb3594c5607bc6
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 4c4b671..63ae022 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 4c4b6719b43b399a9478df18ed95a6bac148e775
+Subproject commit 63ae02248a14aba9166e66768a5fcaed41f23fd1