Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [patch] Rebase keyserver support for update logic

    Change-Id: Iad2502e876600ba966a38f2df3e71bd579f80e8f
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 6269b9ffce8c730eba2a4037075484e007c010b8)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0f813e5..a2fdbf4 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0f813e5298bc272118b055b01d6cddd3c324a4c4
+Subproject commit a2fdbf4d779761724112dfd447b266daa5b420c3