Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - patches: Fix context for linux/map.jinja

    linux/map.jinja was changed upstream, so our patch (silently)
    failed to apply. Adjust the patch context accordingly.

    Change-Id: I3493d1926df1303ed823d7ca5dd8282578617f3c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit ec3604c1a30981ad7e9d3a9ea82f61391c1266cf)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index d1d5c10..91a3426 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit d1d5c106c09790b85e146874122709e876769c12
+Subproject commit 91a3426ee125951d54d7e80ee8c133168221fcba