Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [cleanup] Remove obsolete prototypes

    Tacker POC is replaced by the full os-odl-sfc-noha scenario.

    Change-Id: Ic0648d55e08ccf84244ac286b65fca2656d04a2d
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c034acc..b7383cd 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c034acca79007040c9e1b3e7ad22b166f6ff4d7a
+Subproject commit b7383cda9b6ffdaf6dd8bb07dc74e1c8a7046dbd