Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[odl/dpdk] Set pubilic bridge datapath_type=netdev"
  - [odl/dpdk] Set pubilic bridge datapath_type=netdev

    In order to handle floating IPs related flows properly
    the public bridge requires netdev datapath type to be set
    explicitly in DPDK mode since OpenDaylight only manages
    patches between integration bridge and the public one.

    Change-Id: I868747dc501e9124cbecd4eb1234f74e8edd4edf
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 9d47d1d..81b3142 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 9d47d1dfc5d3ee4a618b5a4e247774c903dbec50
+Subproject commit 81b3142363d36b5328906e084262a723dcdf2fda