Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [cfg01] apt.conf.d: Dpkg::Use-Pty: 0

    This will silence all 'Reading database ...' noise during Salt formula
    installation.

    Change-Id: I734d727194e276443db1e1581f40ec494562196e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 80212433352a59be69f7c82bce8c297bca13eeaf)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0ebc4e0..d99a846 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0ebc4e085cef8e61f4aa03c164f2e2966986c9b0
+Subproject commit d99a846e0aaa5b3de1bc2328a45fb4694fe3f1cf