Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [states] Fix broken online check for bm, vcp nodes

    Previous commit replacing explicit loops with `wait_for` failed to
    properly escape a nested variable, leading to deploy failure.

    Also, the logic was flawed, not breaking for offline nodes, rendering
    the whole barrier check useless.

    Fixes: 1a0e8e7e

    Change-Id: I038dbf90fb53c6b61da2e5c9b6867e31d78867af
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 2f874c8..f78cd79 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 2f874c8729bd80f34e5994fe07f116c82c9b1695
+Subproject commit f78cd791f2529b571152e634aa9141ab993d723e