Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Conform network scheme to tagged public interface"
  - Conform network scheme to tagged public interface

    Change-Id: I503c8ad32900406e1fa375cec9a91b454889d8bf
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 7244993..7d810c4 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 7244993e2da33720870fb4274eaa960519a71587
+Subproject commit 7d810c4b63ec05bb39b1fd6be570623075b6a99d