Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Enable neutron trunk ports"
  - Enable neutron trunk ports

    The network trunk service allows multiple networks to be
    connected to an instance using a single virtual NIC.

    JIRA: FUEL-303
    Change-Id: Id9e7c122bc1a32a59f18167e332ceaaa3897b5ef
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f3a355d..bed4865 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f3a355d5644a7271d9df0a48febc3a93cceddb8e
+Subproject commit bed48658ab74621497baec331d7cdd2c1ef51062