Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Revert "[baremetal] Retire mas01 NAT"

    Although deploy works now without direct internet access on
    the cluster nodes, testing suites seem to require it.

    This reverts commit ed209426e895c7c323d253afd6276bb74df64da0.
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    Change-Id: I35489e18fdd6a4ee6a270e42a3542e5a370bf819

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index d3ab66f..f2a036d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit d3ab66fbc12a16b6d8dc4bf666b25f6b7eaca1d1
+Subproject commit f2a036df813ea9b428a64dc67a924955c9958f2a