Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Swap vcp nodes interfaces

    In order to connect to right underlay
    bridge, swap interfaces.

    Change-Id: I0ae1f50e8d1f3485404bd7e6eea772cab555b313
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 80757cc..c77e7e7 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 80757cccc9e6e3edefc6fa4562d22321486e8ec8
+Subproject commit c77e7e79f11af144275feb3237de07d5fc79f2f6