Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [submodule] Bump Pharos for ericsson-pod1 updates

    This bump also brings in:
    - arm-pod{8,9} config;
    - UNH lab config;
    - NTP config in IDFs for existing PODs;
    - basic vPDF support;

    Change-Id: Ifc16616bc8a13de2bdf048971448d4853e93880e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 28ccbe4..4ee7da0 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 28ccbe4f37cf8b2e38681d4a732f80112888ce84
+Subproject commit 4ee7da0aa1128569bc97e5a28ce10a3ce1aac142