Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [kvm-plugin]Modifying kernel modules

    Omitted the ovs kernel modules from kvmfornfv kernel modules for
    the plugin.

    Change-Id: Id907b829c843587c7fbd7914e19a243b77e7d5aa
    Signed-off-by: Navya Bathula <navyax.bathula@intel.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 64af432..c51f1aa 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 64af432a852c0c0f6b5afc11ddde7609932704db
+Subproject commit c51f1aadff98806a9265bd77a807e2bdd99fef6d