Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [maas] Fix saltstack repo source with arch

    This change avoids bug upstream when salt formula tries to
    complete the repo entry with arch qualification

    Change-Id: I6509bf74bb8f2e69509dfeb63a90434da31e17c2
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index af0c77a..ee1ad80 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit af0c77ae3e7fe3b355ee0e0b08fe931d9b9af8ab
+Subproject commit ee1ad8053b03024a09955ace1709522506ae58c3