Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [ovs/dpdk] Fix location of libvirtd config

    Change-Id: If2e3736af02bb0ca53667116377f2fed4385b048
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 563d010..cd8a3e7 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 563d01057dc2d24619843460ca8b89b156a8e87f
+Subproject commit cd8a3e716911fdd784529078c14dfb859538dce2