Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "deploy.sh: Check hypervisor after prereq install"
  - deploy.sh: Check hypervisor after prereq install

    On a clean system (i.e. no libvirt installed), the prerequisites
    should be installed first, before checking for hypervisor access.

    While at it, add 'libvirt' to the list of prerequisites, as it is
    not automatically required by the others.

    Add a note in the documentation about libvirtd service not being
    automatically started after installation on CentOS.

    Change-Id: I29d94d4a56cd823362811e8fc9c076c83fb6c04c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 40f9072..22bbef8 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 40f907255380dbfc4d808d9f3c768db80c4c8158
+Subproject commit 22bbef86f71a099940e366f11afce777cb0d113c