Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Bring in opendaylight support

    Change-Id: I2eed0cf19907f257be1cb4aee96528cc41f4843a
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index caad7b5..3fb5e54 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit caad7b5e20d66fafb391a37f2bfefc2e654dad6c
+Subproject commit 3fb5e5454045860463a92c18d4d859967002e6fb