Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [patch] Rebase APT keyserver proxy support patch

    Sync our patch with upstream PR [1].

    [1] https://github.com/salt-formulas/salt-formula-linux/pull/138

    Change-Id: If3a51d3aef51accee0901c59e1342b42dbe4be4b
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 78d368731c9582361cc291d5618e01702982f2b9)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index bb693ee..832cf66 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit bb693eeaef1bc9821441a8a473c9393b0f8c2fbb
+Subproject commit 832cf66ab95fbc74bf33a5b271869d0d948b4378