Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - mcp: salt-formulas: opendaylight: AArch64 leveldb

    ODL requires native leveldbjni support on architectures like AArch64,
    provided as a Debian package in ODL Team Nitrogen PPA.

    Only systemd is supported (unlikely to change).

    JIRA: ARMBAND-387

    Change-Id: Ie7f2955c6574ab4584ed0c207b42ed7ab7261561
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 57175f45f6ae9c2ee2adf02ea30a75c0ab956206)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index e29220a..e590566 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit e29220a401a5ad0607453d6a82de9b61d1c02aca
+Subproject commit e590566034d9f1564bbd8b6e6c3c4d9070ae24a3