Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [dpdk] Check whether public bridge exists

    Change-Id: I5aad512b5761deaa30522b6939bf245ecb1ec681
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 7365eee..0b8c159 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 7365eeeb18265d02f874161f2406166280edf7b3
+Subproject commit 0b8c15936be133c6c4aeec36d57329f862f43544