Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Update the reference for scenarios

    Modified the reference link for the scenarios as it colides with
    another installer. To be used with https://gerrit.opnfv.org/gerrit/#/c/45795

    Change-Id: I7b55cfdb877715ec4fa0292adc11e36b7cf4ae53
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 5951192..aa0f463 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 595119281c50edb86b987f5fdd6eac25e28147ae
+Subproject commit aa0f463972db10c96ea61f7f7067477ad28b6482