Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - Merge "[maas] Adopt maas.machines.storage" into stable/fraser
  - [maas] Adopt maas.machines.storage

    Replace MAAS CLI set_disk_layout with the
    new maas.machines.storage state

    JIRA: FUEL-364

    Change-Id: I4d8cd9f473c5386ee7b32ad378ca1e02989233ca
    Signed-off-by: ting wu <ting.wu@enea.com>
    (cherry picked from commit 96019123adad087bc0d744a6785ceebb7b21476d)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f63c58f..996a8a8 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f63c58f98b6ddbf64f300ed0495be3dd88e242e0
+Subproject commit 996a8a8518d5e3baf72b7882112f4a15c184b5eb