Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - reclass: baremetal: Factor out common code

    While at it, add .yamllint file (copied from releng repo).

    Change-Id: I39630c0043fe2fd601510969c401e6cc9efbf69a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit a75af3d4c30af050dd15c0f875142f6328874fe4)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index cfd0fcc..ef570e8 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit cfd0fcc90fa3a3c67289ca4fba26e725f317e4c2
+Subproject commit ef570e8954b44fd608cf1ff5e50b5cbc3d0d178f