Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [jump vnet] Fix udev rule event for older libvirt

    Older libvirt seems to raise 'change' events instead of 'add',
    so the MTU bump of the libvirt managed tap interfaces was not
    properly applied.

    Change-Id: Ie1a4f1c4f235ad4f83bf9ee218a40dcedc1ce914
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f870328..82881d0 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f870328e38c59375b2b19b1667a4baba0ce31bdb
+Subproject commit 82881d06839023576389cb35db8cbe3d42d9c532