Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Bug fix : Increase NUMA nodes RAM

    Each compute node has 16 GB of RAM but those GBs are splited wrongly
    to each NUMA node (4 GB instead of 8 GB).

    JIRA: FUEL-387

    Change-Id: Ibe784727c8a262b41add04ad3a41c70f25ded684
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a40e50c..27ed479 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a40e50c04f27e322e3b4f4e96fe61b78f420937d
+Subproject commit 27ed4796ac54da3c598929c1aeaed62ba14a533b