Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - patches: Drop salt ver sync patch, now upstream

    Upstream pull request [1] was merged, drop out patch.

    [1] https://github.com/salt-formulas/salt-formula-salt/pull/64

    Change-Id: I7aac66349a4bec718f7821b75dbad711cd6acd58
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 8fbafdf8a665fb8fff4d6f9f14c343e109c122ec)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index befec9a..66d147d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit befec9ab2c6fb526afa105f1ce7d71a58a5facac
+Subproject commit 66d147d4d0f471e5a75d9d1691ea42dad36f01ac