Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [odl/dpdk] Use untagged iface for tenant network

    Change-Id: Id35d4cbee9b4ce0a7b78e2935b03c2def68bc123
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index bba197c..c66828d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit bba197c75ad98018e1dec388e6b27217982f154c
+Subproject commit c66828df53e4eff4d9cfdde7b3f5ae3dc5a3883c